diff --git a/channeldb/payment_control.go b/channeldb/payment_control.go
index 6bd09477..440742ca 100644
--- a/channeldb/payment_control.go
+++ b/channeldb/payment_control.go
@@ -246,9 +246,12 @@ func (p *PaymentControl) Success(paymentHash lntypes.Hash,
 // its next call for this payment hash, allowing the switch to make a
 // subsequent payment.
 func (p *PaymentControl) Fail(paymentHash lntypes.Hash,
-	reason FailureReason) error {
+	reason FailureReason) (*route.Route, error) {
 
-	var updateErr error
+	var (
+		updateErr error
+		route     *route.Route
+	)
 	err := p.db.Batch(func(tx *bbolt.Tx) error {
 		// Reset the update error, to avoid carrying over an error
 		// from a previous execution of the batched db transaction.
@@ -270,13 +273,27 @@ func (p *PaymentControl) Fail(paymentHash lntypes.Hash,
 
 		// Put the failure reason in the bucket for record keeping.
 		v := []byte{byte(reason)}
-		return bucket.Put(paymentFailInfoKey, v)
+		err = bucket.Put(paymentFailInfoKey, v)
+		if err != nil {
+			return err
+		}
+
+		// Retrieve attempt info for the notification, if available.
+		attempt, err := fetchPaymentAttempt(bucket)
+		if err != nil && err != errNoAttemptInfo {
+			return err
+		}
+		if err != errNoAttemptInfo {
+			route = &attempt.Route
+		}
+
+		return nil
 	})
 	if err != nil {
-		return err
+		return nil, err
 	}
 
-	return updateErr
+	return route, updateErr
 }
 
 // FetchPayment returns information about a payment from the database.
diff --git a/channeldb/payment_control_test.go b/channeldb/payment_control_test.go
index ea69645f..cc4ae492 100644
--- a/channeldb/payment_control_test.go
+++ b/channeldb/payment_control_test.go
@@ -94,7 +94,7 @@ func TestPaymentControlSwitchFail(t *testing.T) {
 
 	// Fail the payment, which should moved it to Failed.
 	failReason := FailureReasonNoRoute
-	err = pControl.Fail(info.PaymentHash, failReason)
+	_, err = pControl.Fail(info.PaymentHash, failReason)
 	if err != nil {
 		t.Fatalf("unable to fail payment hash: %v", err)
 	}
@@ -270,7 +270,7 @@ func TestPaymentControlFailsWithoutInFlight(t *testing.T) {
 	}
 
 	// Calling Fail should return an error.
-	err = pControl.Fail(info.PaymentHash, FailureReasonNoRoute)
+	_, err = pControl.Fail(info.PaymentHash, FailureReasonNoRoute)
 	if err != ErrPaymentNotInitiated {
 		t.Fatalf("expected ErrPaymentNotInitiated, got %v", err)
 	}
@@ -330,7 +330,7 @@ func TestPaymentControlDeleteNonInFligt(t *testing.T) {
 		if p.failed {
 			// Fail the payment, which should moved it to Failed.
 			failReason := FailureReasonNoRoute
-			err = pControl.Fail(info.PaymentHash, failReason)
+			_, err = pControl.Fail(info.PaymentHash, failReason)
 			if err != nil {
 				t.Fatalf("unable to fail payment hash: %v", err)
 			}
diff --git a/channeldb/payments.go b/channeldb/payments.go
index 7081e14b..f97dc393 100644
--- a/channeldb/payments.go
+++ b/channeldb/payments.go
@@ -94,10 +94,17 @@ const (
 	// destination was found during path finding.
 	FailureReasonNoRoute FailureReason = 1
 
+	// FailureReasonError indicates that an unexpected error happened during
+	// payment.
+	FailureReasonError FailureReason = 2
+
+	// FailureReasonIncorrectPaymentDetails indicates that either the hash
+	// is unknown or the final cltv delta or amount is incorrect.
+	FailureReasonIncorrectPaymentDetails FailureReason = 3
+
 	// TODO(halseth): cancel state.
 
 	// TODO(joostjager): Add failure reasons for:
-	// UnknownPaymentHash, FinalInvalidAmt, FinalInvalidCltv
 	// LocalLiquidityInsufficient, RemoteCapacityInsufficient.
 )
 
@@ -108,6 +115,10 @@ func (r FailureReason) String() string {
 		return "timeout"
 	case FailureReasonNoRoute:
 		return "no_route"
+	case FailureReasonError:
+		return "error"
+	case FailureReasonIncorrectPaymentDetails:
+		return "incorrect_payment_details"
 	}
 
 	return "unknown"
diff --git a/lnrpc/routerrpc/router.pb.go b/lnrpc/routerrpc/router.pb.go
index c38c5e9c..6249d28b 100644
--- a/lnrpc/routerrpc/router.pb.go
+++ b/lnrpc/routerrpc/router.pb.go
@@ -39,6 +39,13 @@ const (
 	//All possible routes were tried and failed permanently. Or were no
 	//routes to the destination at all.
 	PaymentState_FAILED_NO_ROUTE PaymentState = 3
+	//*
+	//A non-recoverable error has occured.
+	PaymentState_FAILED_ERROR PaymentState = 4
+	//*
+	//Payment details incorrect (unknown hash, invalid amt or
+	//invalid final cltv delta)
+	PaymentState_FAILED_INCORRECT_PAYMENT_DETAILS PaymentState = 5
 )
 
 var PaymentState_name = map[int32]string{
@@ -46,13 +53,17 @@ var PaymentState_name = map[int32]string{
 	1: "SUCCEEDED",
 	2: "FAILED_TIMEOUT",
 	3: "FAILED_NO_ROUTE",
+	4: "FAILED_ERROR",
+	5: "FAILED_INCORRECT_PAYMENT_DETAILS",
 }
 
 var PaymentState_value = map[string]int32{
-	"IN_FLIGHT":       0,
-	"SUCCEEDED":       1,
-	"FAILED_TIMEOUT":  2,
-	"FAILED_NO_ROUTE": 3,
+	"IN_FLIGHT":                        0,
+	"SUCCEEDED":                        1,
+	"FAILED_TIMEOUT":                   2,
+	"FAILED_NO_ROUTE":                  3,
+	"FAILED_ERROR":                     4,
+	"FAILED_INCORRECT_PAYMENT_DETAILS": 5,
 }
 
 func (x PaymentState) String() string {
@@ -189,10 +200,13 @@ type SendPaymentRequest struct {
 	//*
 	//An optional maximum total time lock for the route. If zero, there is no
 	//maximum enforced.
-	CltvLimit            int32    `protobuf:"varint,9,opt,name=cltv_limit,json=cltvLimit,proto3" json:"cltv_limit,omitempty"`
-	XXX_NoUnkeyedLiteral struct{} `json:"-"`
-	XXX_unrecognized     []byte   `json:"-"`
-	XXX_sizecache        int32    `json:"-"`
+	CltvLimit int32 `protobuf:"varint,9,opt,name=cltv_limit,json=cltvLimit,proto3" json:"cltv_limit,omitempty"`
+	//*
+	//Optional route hints to reach the destination through private channels.
+	RouteHints           []*lnrpc.RouteHint `protobuf:"bytes,10,rep,name=route_hints,proto3" json:"route_hints,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}           `json:"-"`
+	XXX_unrecognized     []byte             `json:"-"`
+	XXX_sizecache        int32              `json:"-"`
 }
 
 func (m *SendPaymentRequest) Reset()         { *m = SendPaymentRequest{} }
@@ -283,6 +297,13 @@ func (m *SendPaymentRequest) GetCltvLimit() int32 {
 	return 0
 }
 
+func (m *SendPaymentRequest) GetRouteHints() []*lnrpc.RouteHint {
+	if m != nil {
+		return m.RouteHints
+	}
+	return nil
+}
+
 type TrackPaymentRequest struct {
 	/// The hash of the payment to look up.
 	PaymentHash          []byte   `protobuf:"bytes,1,opt,name=payment_hash,json=paymentHash,proto3" json:"payment_hash,omitempty"`
@@ -1146,106 +1167,109 @@ func init() {
 func init() { proto.RegisterFile("routerrpc/router.proto", fileDescriptor_7a0613f69d37b0a5) }
 
 var fileDescriptor_7a0613f69d37b0a5 = []byte{
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+	0xab, 0x15, 0x22, 0x44, 0x6d, 0x28, 0x24, 0x76, 0x71, 0x74, 0x96, 0xc8, 0xc0, 0xc3, 0x1d, 0xbd,
+	0x6a, 0xee, 0xde, 0xf1, 0x16, 0xd1, 0x6f, 0x52, 0xe8, 0x8f, 0x50, 0x4c, 0x6e, 0x96, 0x28, 0xb9,
+	0x31, 0xec, 0x58, 0x39, 0x3f, 0xaa, 0xeb, 0x2d, 0x18, 0x38, 0x12, 0xde, 0x4c, 0xbe, 0xf6, 0xf1,
+	0xce, 0x86, 0xaa, 0x09, 0xfe, 0xd6, 0x22, 0x58, 0x3d, 0xdd, 0x29, 0x8b, 0xfb, 0xa3, 0xa3, 0xaf,
+	0x18, 0x6f, 0x4d, 0x0f, 0xae, 0xb8, 0xb9, 0xaa, 0x55, 0x5f, 0x3c, 0x26, 0x8e, 0xb5, 0x8d, 0xe0,
+	0x68, 0x47, 0x27, 0xa3, 0x5f, 0x25, 0x3d, 0x78, 0x74, 0x0e, 0x54, 0x5f, 0xfe, 0x1c, 0x6d, 0x6d,
+	0x65, 0x47, 0xcb, 0x6f, 0x58, 0x79, 0x7c, 0x60, 0x6c, 0x58, 0xf9, 0xc8, 0xe4, 0x78, 0xf3, 0xdb,
+	0x3f, 0x5d, 0x8d, 0x3d, 0x31, 0x59, 0xdc, 0x5c, 0x0e, 0x83, 0xd9, 0xd5, 0xd4, 0x1b, 0x4f, 0x84,
+	0xef, 0xf9, 0x63, 0x9f, 0x8b, 0xbf, 0x04, 0xe1, 0xdd, 0xd5, 0xd4, 0x1f, 0x5d, 0xa9, 0x2d, 0xf4,
+	0x6a, 0xa5, 0xee, 0x66, 0x5f, 0xfd, 0x0f, 0xf7, 0xbb, 0xff, 0x07, 0x00, 0x00, 0xff, 0xff, 0xb7,
+	0x0c, 0x44, 0x60, 0xf3, 0x0d, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
diff --git a/lnrpc/routerrpc/router.proto b/lnrpc/routerrpc/router.proto
index 8646bd03..b2e51317 100644
--- a/lnrpc/routerrpc/router.proto
+++ b/lnrpc/routerrpc/router.proto
@@ -58,6 +58,11 @@ message SendPaymentRequest {
     maximum enforced.
     */
     int32 cltv_limit = 9;
+
+    /**
+    Optional route hints to reach the destination through private channels.
+    */
+    repeated lnrpc.RouteHint route_hints = 10 [json_name = "route_hints"];
 }
 
 message TrackPaymentRequest {
@@ -86,6 +91,17 @@ enum PaymentState {
     routes to the destination at all.
     */
     FAILED_NO_ROUTE = 3;
+
+    /**
+    A non-recoverable error has occured.
+    */
+    FAILED_ERROR = 4;
+
+    /**
+    Payment details incorrect (unknown hash, invalid amt or
+    invalid final cltv delta)
+    */
+    FAILED_INCORRECT_PAYMENT_DETAILS = 5;
 }
 
 
diff --git a/lnrpc/routerrpc/router_backend.go b/lnrpc/routerrpc/router_backend.go
index af102006..9916ff15 100644
--- a/lnrpc/routerrpc/router_backend.go
+++ b/lnrpc/routerrpc/router_backend.go
@@ -6,6 +6,8 @@ import (
 	"fmt"
 	"time"
 
+	"github.com/btcsuite/btcd/btcec"
+
 	"github.com/btcsuite/btcd/chaincfg"
 	"github.com/btcsuite/btcutil"
 	"github.com/lightningnetwork/lnd/lnrpc"
@@ -382,6 +384,15 @@ func (r *RouterBackend) extractIntentFromSendRequest(
 	payIntent.PayAttemptTimeout = time.Second *
 		time.Duration(rpcPayReq.TimeoutSeconds)
 
+	// Route hints.
+	routeHints, err := unmarshallRouteHints(
+		rpcPayReq.RouteHints,
+	)
+	if err != nil {
+		return nil, err
+	}
+	payIntent.RouteHints = routeHints
+
 	// If the payment request field isn't blank, then the details of the
 	// invoice are encoded entirely within the encoded payReq.  So we'll
 	// attempt to decode it, populating the payment accordingly.
@@ -443,7 +454,9 @@ func (r *RouterBackend) extractIntentFromSendRequest(
 		copy(payIntent.Target[:], destKey)
 
 		payIntent.FinalCLTVDelta = uint16(payReq.MinFinalCLTVExpiry())
-		payIntent.RouteHints = payReq.RouteHints
+		payIntent.RouteHints = append(
+			payIntent.RouteHints, payReq.RouteHints...,
+		)
 	} else {
 		// Otherwise, If the payment request field was not specified
 		// (and a custom route wasn't specified), construct the payment
@@ -493,6 +506,50 @@ func (r *RouterBackend) extractIntentFromSendRequest(
 	return payIntent, nil
 }
 
+// unmarshallRouteHints unmarshalls a list of route hints.
+func unmarshallRouteHints(rpcRouteHints []*lnrpc.RouteHint) (
+	[][]zpay32.HopHint, error) {
+
+	routeHints := make([][]zpay32.HopHint, 0, len(rpcRouteHints))
+	for _, rpcRouteHint := range rpcRouteHints {
+		routeHint := make(
+			[]zpay32.HopHint, 0, len(rpcRouteHint.HopHints),
+		)
+		for _, rpcHint := range rpcRouteHint.HopHints {
+			hint, err := unmarshallHopHint(rpcHint)
+			if err != nil {
+				return nil, err
+			}
+
+			routeHint = append(routeHint, hint)
+		}
+		routeHints = append(routeHints, routeHint)
+	}
+
+	return routeHints, nil
+}
+
+// unmarshallHopHint unmarshalls a single hop hint.
+func unmarshallHopHint(rpcHint *lnrpc.HopHint) (zpay32.HopHint, error) {
+	pubBytes, err := hex.DecodeString(rpcHint.NodeId)
+	if err != nil {
+		return zpay32.HopHint{}, err
+	}
+
+	pubkey, err := btcec.ParsePubKey(pubBytes, btcec.S256())
+	if err != nil {
+		return zpay32.HopHint{}, err
+	}
+
+	return zpay32.HopHint{
+		NodeID:                    pubkey,
+		ChannelID:                 rpcHint.ChanId,
+		FeeBaseMSat:               rpcHint.FeeBaseMsat,
+		FeeProportionalMillionths: rpcHint.FeeProportionalMillionths,
+		CLTVExpiryDelta:           uint16(rpcHint.CltvExpiryDelta),
+	}, nil
+}
+
 // ValidatePayReqExpiry checks if the passed payment request has expired. In
 // the case it has expired, an error will be returned.
 func ValidatePayReqExpiry(payReq *zpay32.Invoice) error {
diff --git a/lnrpc/routerrpc/router_server.go b/lnrpc/routerrpc/router_server.go
index b900f6bf..6291a547 100644
--- a/lnrpc/routerrpc/router_server.go
+++ b/lnrpc/routerrpc/router_server.go
@@ -502,8 +502,10 @@ func (s *Server) TrackPayment(request *TrackPaymentRequest,
 func (s *Server) trackPayment(paymentHash lntypes.Hash,
 	stream Router_TrackPaymentServer) error {
 
+	router := s.cfg.RouterBackend
+
 	// Subscribe to the outcome of this payment.
-	inFlight, resultChan, err := s.cfg.RouterBackend.Tower.SubscribePayment(
+	inFlight, resultChan, err := router.Tower.SubscribePayment(
 		paymentHash,
 	)
 	switch {
@@ -538,20 +540,21 @@ func (s *Server) trackPayment(paymentHash lntypes.Hash,
 
 			status.State = PaymentState_SUCCEEDED
 			status.Preimage = result.Preimage[:]
-			status.Route = s.cfg.RouterBackend.MarshallRoute(
+			status.Route = router.MarshallRoute(
 				result.Route,
 			)
 		} else {
-			switch result.FailureReason {
-
-			case channeldb.FailureReasonTimeout:
-				status.State = PaymentState_FAILED_TIMEOUT
-
-			case channeldb.FailureReasonNoRoute:
-				status.State = PaymentState_FAILED_NO_ROUTE
-
-			default:
-				return errors.New("unknown failure reason")
+			state, err := marshallFailureReason(
+				result.FailureReason,
+			)
+			if err != nil {
+				return err
+			}
+			status.State = state
+			if result.Route != nil {
+				status.Route = router.MarshallRoute(
+					result.Route,
+				)
 			}
 		}
 
@@ -568,3 +571,26 @@ func (s *Server) trackPayment(paymentHash lntypes.Hash,
 
 	return nil
 }
+
+// marshallFailureReason marshalls the failure reason to the corresponding rpc
+// type.
+func marshallFailureReason(reason channeldb.FailureReason) (
+	PaymentState, error) {
+
+	switch reason {
+
+	case channeldb.FailureReasonTimeout:
+		return PaymentState_FAILED_TIMEOUT, nil
+
+	case channeldb.FailureReasonNoRoute:
+		return PaymentState_FAILED_NO_ROUTE, nil
+
+	case channeldb.FailureReasonError:
+		return PaymentState_FAILED_ERROR, nil
+
+	case channeldb.FailureReasonIncorrectPaymentDetails:
+		return PaymentState_FAILED_INCORRECT_PAYMENT_DETAILS, nil
+	}
+
+	return 0, errors.New("unknown failure reason")
+}
diff --git a/lntest/itest/lnd_test.go b/lntest/itest/lnd_test.go
index 220fb53f..daacd334 100644
--- a/lntest/itest/lnd_test.go
+++ b/lntest/itest/lnd_test.go
@@ -13834,7 +13834,7 @@ func testHoldInvoicePersistence(net *lntest.NetworkHarness, t *harnessTest) {
 						status.State)
 				}
 			} else {
-				if status.State != routerrpc.PaymentState_FAILED_NO_ROUTE {
+				if status.State != routerrpc.PaymentState_FAILED_INCORRECT_PAYMENT_DETAILS {
 					t.Fatalf("state not failed: %v",
 						status.State)
 				}
diff --git a/routing/control_tower.go b/routing/control_tower.go
index d8a1e097..0bf08476 100644
--- a/routing/control_tower.go
+++ b/routing/control_tower.go
@@ -114,16 +114,41 @@ func (p *controlTower) Success(paymentHash lntypes.Hash,
 
 	// Notify subscribers of success event.
 	p.notifyFinalEvent(
-		paymentHash, PaymentResult{
-			Success:  true,
-			Preimage: preimage,
-			Route:    route,
-		},
+		paymentHash, createSuccessResult(route, preimage),
 	)
 
 	return nil
 }
 
+// createSuccessResult creates a success result to send to subscribers.
+func createSuccessResult(rt *route.Route,
+	preimage lntypes.Preimage) *PaymentResult {
+
+	return &PaymentResult{
+		Success:  true,
+		Preimage: preimage,
+		Route:    rt,
+	}
+}
+
+// createFailResult creates a failed result to send to subscribers.
+func createFailedResult(rt *route.Route,
+	reason channeldb.FailureReason) *PaymentResult {
+
+	result := &PaymentResult{
+		Success:       false,
+		FailureReason: reason,
+	}
+
+	// In case of incorrect payment details, set the route. This can be used
+	// for probing and to extract a fee estimate from the route.
+	if reason == channeldb.FailureReasonIncorrectPaymentDetails {
+		result.Route = rt
+	}
+
+	return result
+}
+
 // Fail transitions a payment into the Failed state, and records the reason the
 // payment failed. After invoking this method, InitPayment should return nil on
 // its next call for this payment hash, allowing the switch to make a
@@ -131,17 +156,14 @@ func (p *controlTower) Success(paymentHash lntypes.Hash,
 func (p *controlTower) Fail(paymentHash lntypes.Hash,
 	reason channeldb.FailureReason) error {
 
-	err := p.db.Fail(paymentHash, reason)
+	route, err := p.db.Fail(paymentHash, reason)
 	if err != nil {
 		return err
 	}
 
 	// Notify subscribers of fail event.
 	p.notifyFinalEvent(
-		paymentHash, PaymentResult{
-			Success:       false,
-			FailureReason: reason,
-		},
+		paymentHash, createFailedResult(route, reason),
 	)
 
 	return nil
@@ -191,16 +213,21 @@ func (p *controlTower) SubscribePayment(paymentHash lntypes.Hash) (
 	// a subscriber, because we can send the result on the channel
 	// immediately.
 	case channeldb.StatusSucceeded:
-		event.Success = true
-		event.Preimage = *payment.PaymentPreimage
-		event.Route = &payment.Attempt.Route
+		event = *createSuccessResult(
+			&payment.Attempt.Route, *payment.PaymentPreimage,
+		)
 
 	// Payment already failed. It is not necessary to register as a
 	// subscriber, because we can send the result on the channel
 	// immediately.
 	case channeldb.StatusFailed:
-		event.Success = false
-		event.FailureReason = *payment.Failure
+		var route *route.Route
+		if payment.Attempt != nil {
+			route = &payment.Attempt.Route
+		}
+		event = *createFailedResult(
+			route, *payment.Failure,
+		)
 
 	default:
 		return false, nil, errors.New("unknown payment status")
@@ -216,7 +243,7 @@ func (p *controlTower) SubscribePayment(paymentHash lntypes.Hash) (
 // notifyFinalEvent sends a final payment event to all subscribers of this
 // payment. The channel will be closed after this.
 func (p *controlTower) notifyFinalEvent(paymentHash lntypes.Hash,
-	event PaymentResult) {
+	event *PaymentResult) {
 
 	// Get all subscribers for this hash. As there is only a single outcome,
 	// the subscriber list can be cleared.
@@ -232,7 +259,7 @@ func (p *controlTower) notifyFinalEvent(paymentHash lntypes.Hash,
 	// Notify all subscribers of the event. The subscriber channel is
 	// buffered, so it cannot block here.
 	for _, subscriber := range list {
-		subscriber <- event
+		subscriber <- *event
 		close(subscriber)
 	}
 }
diff --git a/routing/payment_lifecycle.go b/routing/payment_lifecycle.go
index 677e6c70..cec91e9d 100644
--- a/routing/payment_lifecycle.go
+++ b/routing/payment_lifecycle.go
@@ -341,39 +341,41 @@ func (p *paymentLifecycle) sendPaymentAttempt(firstHop lnwire.ShortChannelID,
 // handleSendError inspects the given error from the Switch and determines
 // whether we should make another payment attempt.
 func (p *paymentLifecycle) handleSendError(sendErr error) error {
-	var finalOutcome bool
+	var reason channeldb.FailureReason
 
 	// If an internal, non-forwarding error occurred, we can stop trying.
 	fErr, ok := sendErr.(*htlcswitch.ForwardingError)
 	if !ok {
-		finalOutcome = true
+		reason = channeldb.FailureReasonError
 	} else {
-		finalOutcome = p.router.processSendError(
+		var final bool
+		final, reason = p.router.processSendError(
 			p.paySession, &p.attempt.Route, fErr,
 		)
 
-		// Save the forwarding error so it can be returned if this turns
-		// out to be the last attempt.
-		p.lastError = fErr
-	}
+		if !final {
+			// Save the forwarding error so it can be returned if
+			// this turns out to be the last attempt.
+			p.lastError = fErr
 
-	if finalOutcome {
-		log.Errorf("Payment %x failed with final outcome: %v",
-			p.payment.PaymentHash, sendErr)
-
-		// Mark the payment failed with no route.
-		// TODO(halseth): make payment codes for the actual reason we
-		// don't continue path finding.
-		err := p.router.cfg.Control.Fail(
-			p.payment.PaymentHash, channeldb.FailureReasonNoRoute,
-		)
-		if err != nil {
-			return err
+			return nil
 		}
-
-		// Terminal state, return the error we encountered.
-		return sendErr
 	}
 
-	return nil
+	log.Debugf("Payment %x failed: final_outcome=%v, raw_err=%v",
+		p.payment.PaymentHash, reason, sendErr)
+
+	// Mark the payment failed with no route.
+	//
+	// TODO(halseth): make payment codes for the actual reason we don't
+	// continue path finding.
+	err := p.router.cfg.Control.Fail(
+		p.payment.PaymentHash, reason,
+	)
+	if err != nil {
+		return err
+	}
+
+	// Terminal state, return the error we encountered.
+	return sendErr
 }
diff --git a/routing/router.go b/routing/router.go
index 972be896..00e4d94b 100644
--- a/routing/router.go
+++ b/routing/router.go
@@ -1812,7 +1812,8 @@ func (r *ChannelRouter) sendPayment(
 // to continue with an alternative route. This is indicated by the boolean
 // return value.
 func (r *ChannelRouter) processSendError(paySession PaymentSession,
-	rt *route.Route, fErr *htlcswitch.ForwardingError) bool {
+	rt *route.Route, fErr *htlcswitch.ForwardingError) (
+	bool, channeldb.FailureReason) {
 
 	errSource := fErr.ErrorSource
 	errVertex := route.NewVertex(errSource)
@@ -1825,7 +1826,7 @@ func (r *ChannelRouter) processSendError(paySession PaymentSession,
 		rt, route.Vertex(errVertex),
 	)
 	if err != nil {
-		return true
+		return true, channeldb.FailureReasonError
 	}
 
 	// processChannelUpdateAndRetry is a closure that
@@ -1868,22 +1869,33 @@ func (r *ChannelRouter) processSendError(paySession PaymentSession,
 	// hash or we sent the wrong payment amount to the
 	// destination, then we'll terminate immediately.
 	case *lnwire.FailUnknownPaymentHash:
-		return true
+		// TODO(joostjager): Check onionErr.Amount() whether it matches
+		// what we expect. (Will it ever not match, because if not
+		// final_incorrect_htlc_amount would be returned?)
+
+		return true, channeldb.FailureReasonIncorrectPaymentDetails
 
 	// If we sent the wrong amount to the destination, then
 	// we'll exit early.
 	case *lnwire.FailIncorrectPaymentAmount:
-		return true
+		return true, channeldb.FailureReasonIncorrectPaymentDetails
 
 	// If the time-lock that was extended to the final node
 	// was incorrect, then we can't proceed.
 	case *lnwire.FailFinalIncorrectCltvExpiry:
-		return true
+		// TODO(joostjager): Take into account that second last hop may
+		// have deliberately handed out an htlc that expires too soon.
+		// In that case we should continue routing.
+		return true, channeldb.FailureReasonError
 
 	// If we crafted an invalid onion payload for the final
 	// node, then we'll exit early.
 	case *lnwire.FailFinalIncorrectHtlcAmount:
-		return true
+		// TODO(joostjager): Take into account that second last hop may
+		// have deliberately handed out an htlc with a too low value. In
+		// that case we should continue routing.
+
+		return true, channeldb.FailureReasonError
 
 	// Similarly, if the HTLC expiry that we extended to
 	// the final hop expires too soon, then will fail the
@@ -1892,12 +1904,15 @@ func (r *ChannelRouter) processSendError(paySession PaymentSession,
 	// TODO(roasbeef): can happen to to race condition, try
 	// again with recent block height
 	case *lnwire.FailFinalExpiryTooSoon:
-		return true
+		// TODO(joostjager): Take into account that any hop may have
+		// delayed. Ideally we should continue routing. Knowing the
+		// delaying node at this point would help.
+		return true, channeldb.FailureReasonIncorrectPaymentDetails
 
 	// If we erroneously attempted to cross a chain border,
 	// then we'll cancel the payment.
 	case *lnwire.FailInvalidRealm:
-		return true
+		return true, channeldb.FailureReasonError
 
 	// If we get a notice that the expiry was too soon for
 	// an intermediate node, then we'll prune out the node
@@ -1906,17 +1921,20 @@ func (r *ChannelRouter) processSendError(paySession PaymentSession,
 	case *lnwire.FailExpiryTooSoon:
 		r.applyChannelUpdate(&onionErr.Update, errSource)
 		paySession.ReportVertexFailure(errVertex)
-		return false
+		return false, 0
 
-	// If we hit an instance of onion payload corruption or
-	// an invalid version, then we'll exit early as this
-	// shouldn't happen in the typical case.
+	// If we hit an instance of onion payload corruption or an invalid
+	// version, then we'll exit early as this shouldn't happen in the
+	// typical case.
+	//
+	// TODO(joostjager): Take into account that the previous hop may have
+	// tampered with the onion. Routing should continue using other paths.
 	case *lnwire.FailInvalidOnionVersion:
-		return true
+		return true, channeldb.FailureReasonError
 	case *lnwire.FailInvalidOnionHmac:
-		return true
+		return true, channeldb.FailureReasonError
 	case *lnwire.FailInvalidOnionKey:
-		return true
+		return true, channeldb.FailureReasonError
 
 	// If we get a failure due to violating the minimum
 	// amount, we'll apply the new minimum amount and retry
@@ -1925,7 +1943,7 @@ func (r *ChannelRouter) processSendError(paySession PaymentSession,
 		processChannelUpdateAndRetry(
 			&onionErr.Update, errSource,
 		)
-		return false
+		return false, 0
 
 	// If we get a failure due to a fee, we'll apply the
 	// new fee update, and retry our attempt using the
@@ -1934,7 +1952,7 @@ func (r *ChannelRouter) processSendError(paySession PaymentSession,
 		processChannelUpdateAndRetry(
 			&onionErr.Update, errSource,
 		)
-		return false
+		return false, 0
 
 	// If we get the failure for an intermediate node that
 	// disagrees with our time lock values, then we'll
@@ -1943,7 +1961,7 @@ func (r *ChannelRouter) processSendError(paySession PaymentSession,
 		processChannelUpdateAndRetry(
 			&onionErr.Update, errSource,
 		)
-		return false
+		return false, 0
 
 	// The outgoing channel that this node was meant to
 	// forward one is currently disabled, so we'll apply
@@ -1951,7 +1969,7 @@ func (r *ChannelRouter) processSendError(paySession PaymentSession,
 	case *lnwire.FailChannelDisabled:
 		r.applyChannelUpdate(&onionErr.Update, errSource)
 		paySession.ReportEdgeFailure(failedEdge, 0)
-		return false
+		return false, 0
 
 	// It's likely that the outgoing channel didn't have
 	// sufficient capacity, so we'll prune this edge for
@@ -1959,21 +1977,21 @@ func (r *ChannelRouter) processSendError(paySession PaymentSession,
 	case *lnwire.FailTemporaryChannelFailure:
 		r.applyChannelUpdate(onionErr.Update, errSource)
 		paySession.ReportEdgeFailure(failedEdge, failedAmt)
-		return false
+		return false, 0
 
 	// If the send fail due to a node not having the
 	// required features, then we'll note this error and
 	// continue.
 	case *lnwire.FailRequiredNodeFeatureMissing:
 		paySession.ReportVertexFailure(errVertex)
-		return false
+		return false, 0
 
 	// If the send fail due to a node not having the
 	// required features, then we'll note this error and
 	// continue.
 	case *lnwire.FailRequiredChannelFeatureMissing:
 		paySession.ReportVertexFailure(errVertex)
-		return false
+		return false, 0
 
 	// If the next hop in the route wasn't known or
 	// offline, we'll only the channel which we attempted
@@ -1984,18 +2002,18 @@ func (r *ChannelRouter) processSendError(paySession PaymentSession,
 	// another node.
 	case *lnwire.FailUnknownNextPeer:
 		paySession.ReportEdgeFailure(failedEdge, 0)
-		return false
+		return false, 0
 
 	// If the node wasn't able to forward for which ever
 	// reason, then we'll note this and continue with the
 	// routes.
 	case *lnwire.FailTemporaryNodeFailure:
 		paySession.ReportVertexFailure(errVertex)
-		return false
+		return false, 0
 
 	case *lnwire.FailPermanentNodeFailure:
 		paySession.ReportVertexFailure(errVertex)
-		return false
+		return false, 0
 
 	// If we crafted a route that contains a too long time
 	// lock for an intermediate node, we'll prune the node.
@@ -2008,7 +2026,7 @@ func (r *ChannelRouter) processSendError(paySession PaymentSession,
 	// that node.
 	case *lnwire.FailExpiryTooFar:
 		paySession.ReportVertexFailure(errVertex)
-		return false
+		return false, 0
 
 	// If we get a permanent channel or node failure, then
 	// we'll prune the channel in both directions and
@@ -2020,10 +2038,10 @@ func (r *ChannelRouter) processSendError(paySession PaymentSession,
 			to:      failedEdge.from,
 			channel: failedEdge.channel,
 		}, 0)
-		return false
+		return false, 0
 
 	default:
-		return true
+		return true, channeldb.FailureReasonError
 	}
 }