diff --git a/hledger-lib/Hledger/Data/PeriodicTransaction.hs b/hledger-lib/Hledger/Data/PeriodicTransaction.hs
index a119bb1ee..93c6fbd72 100644
--- a/hledger-lib/Hledger/Data/PeriodicTransaction.hs
+++ b/hledger-lib/Hledger/Data/PeriodicTransaction.hs
@@ -61,6 +61,7 @@ instance Show PeriodicTransaction where
       ("ptperiodexpr=" ++ show ptperiodexpr)
       ("ptinterval=" ++ show ptinterval)
       ("ptspan=" ++ show (show ptspan))
+      ("ptsourcepos=" ++ show ptsourcepos)
       ("ptstatus=" ++ show (show ptstatus))
       ("ptcode=" ++ show ptcode)
       ("ptdescription=" ++ show ptdescription)
@@ -236,7 +237,8 @@ runPeriodicTransaction PeriodicTransaction{..} requestedspan =
     [ t{tdate=d} | (DateSpan (Just d) _) <- alltxnspans, spanContainsDate requestedspan d ]
   where
     t = nulltransaction{
-           tstatus      = ptstatus
+           tsourcepos   = ptsourcepos
+          ,tstatus      = ptstatus
           ,tcode        = ptcode
           ,tdescription = ptdescription
           ,tcomment     = ptcomment
diff --git a/hledger-lib/Hledger/Data/Types.hs b/hledger-lib/Hledger/Data/Types.hs
index 2ec0dbef4..c7a512e17 100644
--- a/hledger-lib/Hledger/Data/Types.hs
+++ b/hledger-lib/Hledger/Data/Types.hs
@@ -455,6 +455,7 @@ data PeriodicTransaction = PeriodicTransaction {
       ptinterval     :: Interval, -- ^ the interval at which this transaction recurs
       ptspan         :: DateSpan, -- ^ the (possibly unbounded) period during which this transaction recurs. Contains a whole number of intervals.
       --
+      ptsourcepos    :: (SourcePos, SourcePos),  -- ^ the file position where the period expression starts, and where the last posting ends
       ptstatus       :: Status,   -- ^ some of Transaction's fields
       ptcode         :: Text,
       ptdescription  :: Text,
@@ -467,6 +468,7 @@ nullperiodictransaction = PeriodicTransaction{
       ptperiodexpr   = ""
      ,ptinterval     = def
      ,ptspan         = def
+     ,ptsourcepos    = (SourcePos "" (mkPos 1) (mkPos 1), SourcePos "" (mkPos 1) (mkPos 1))
      ,ptstatus       = Unmarked
      ,ptcode         = ""
      ,ptdescription  = ""
diff --git a/hledger-lib/Hledger/Read/JournalReader.hs b/hledger-lib/Hledger/Read/JournalReader.hs
index 753f66969..281014b4c 100644
--- a/hledger-lib/Hledger/Read/JournalReader.hs
+++ b/hledger-lib/Hledger/Read/JournalReader.hs
@@ -708,6 +708,7 @@ transactionmodifierp = do
 -- relative to Y/1/1. If not, they are calculated related to today as usual.
 periodictransactionp :: MonadIO m => JournalParser m PeriodicTransaction
 periodictransactionp = do
+  startpos <- getSourcePos
 
   -- first line
   char '~' <?> "periodic transaction"
@@ -752,10 +753,14 @@ periodictransactionp = do
   -- next lines; use same year determined above
   postings <- postingsp (Just $ first3 $ toGregorian refdate)
 
+  endpos <- getSourcePos
+  let sourcepos = (startpos, endpos)
+
   return $ nullperiodictransaction{
      ptperiodexpr=periodtxt
     ,ptinterval=interval
     ,ptspan=spn
+    ,ptsourcepos=sourcepos
     ,ptstatus=status
     ,ptcode=code
     ,ptdescription=description
@@ -892,6 +897,7 @@ tests_JournalReader = testGroup "JournalReader" [
          ptperiodexpr  = "monthly from 2018/6"
         ,ptinterval    = Months 1
         ,ptspan        = DateSpan (Just $ fromGregorian 2018 6 1) Nothing
+        ,ptsourcepos   = (SourcePos "" (mkPos 1) (mkPos 1), SourcePos "" (mkPos 2) (mkPos 1))
         ,ptdescription = ""
         ,ptcomment     = "In 2019 we will change this\n"
         }
@@ -902,6 +908,7 @@ tests_JournalReader = testGroup "JournalReader" [
          ptperiodexpr  = "monthly from 2018/6"
         ,ptinterval    = Months 1
         ,ptspan        = DateSpan (Just $ fromGregorian 2018 6 1) Nothing
+        ,ptsourcepos   = (SourcePos "" (mkPos 1) (mkPos 1), SourcePos "" (mkPos 2) (mkPos 1))
         ,ptdescription = "In 2019 we will change this"
         ,ptcomment     = ""
         }
@@ -912,6 +919,7 @@ tests_JournalReader = testGroup "JournalReader" [
          ptperiodexpr  = "monthly"
         ,ptinterval    = Months 1
         ,ptspan        = DateSpan Nothing Nothing
+        ,ptsourcepos   = (SourcePos "" (mkPos 1) (mkPos 1), SourcePos "" (mkPos 2) (mkPos 1))
         ,ptdescription = "Next year blah blah"
         ,ptcomment     = ""
         }
@@ -922,6 +930,7 @@ tests_JournalReader = testGroup "JournalReader" [
          ptperiodexpr  = "2019-01-04"
         ,ptinterval    = NoInterval
         ,ptspan        = DateSpan (Just $ fromGregorian 2019 1 4) (Just $ fromGregorian 2019 1 5)
+        ,ptsourcepos   = (SourcePos "" (mkPos 1) (mkPos 1), SourcePos "" (mkPos 2) (mkPos 1))
         ,ptdescription = ""
         ,ptcomment     = ""
         }
diff --git a/hledger-web/Hledger/Web/Test.hs b/hledger-web/Hledger/Web/Test.hs
index 27e7cc67f..f99718d3f 100644
--- a/hledger-web/Hledger/Web/Test.hs
+++ b/hledger-web/Hledger/Web/Test.hs
@@ -97,5 +97,5 @@ hledgerWebTest = do
       yit "serves a journal page showing forecasted transactions" $ do
         get JournalR
         statusIs 200
-        bodyContains "id=\"transaction-0-1\""  -- 0 indicates a fileless (forecasted) txn
-        bodyContains "id=\"transaction-0-2\""  -- etc.
+        bodyContains "id=\"transaction-2-1\""
+        bodyContains "id=\"transaction-2-2\""
diff --git a/hledger/test/forecast.test b/hledger/test/forecast.test
index 3307d070e..ccda92384 100644
--- a/hledger/test/forecast.test
+++ b/hledger/test/forecast.test
@@ -374,3 +374,21 @@ $ hledger -f- --today=2021-05-01 reg --period=2020-2022 --forecast=2020-2022
 # 2021-07-01                      (a)                              1             2
 # 2021-10-01                      (a)                              1             3
 # >=0
+
+# 22. Printed JSON with forecast transactions reference periodic transactions source position
+<
+~ next quarter   Forecasted
+    A      -1
+    B       1
+
+$ hledger -f- print --forecast -O json
+> /.*
+        "sourceColumn": 1,
+        "sourceLine": 1,
+        "sourceName": "-"
+      },
+      {
+        "sourceColumn": 1,
+        "sourceLine": 4,
+        "sourceName": "-"
+.*/