diff --git a/.hlint.yaml b/.hlint.yaml
index f8622249f..5e6ed11ec 100644
--- a/.hlint.yaml
+++ b/.hlint.yaml
@@ -11,7 +11,6 @@
 - ignore: {name: "Redundant $"}
 - ignore: {name: "Redundant bracket"}
 - ignore: {name: "Avoid reverse"}
-- ignore: {name: "Eta reduce"}
 - ignore: {name: "Use sortOn"}
 - ignore: {name: "Use camelCase"}
 - ignore: {name: "Use list comprehension"}
diff --git a/bin/_hledger-chart.hs b/bin/_hledger-chart.hs
index 5dd0c5ce6..e4af1d8b3 100755
--- a/bin/_hledger-chart.hs
+++ b/bin/_hledger-chart.hs
@@ -183,7 +183,7 @@ sameSignNonZero is
 
 -- | Build a single pie chart item
 accountPieItem :: AccountName -> Double -> PieItem
-accountPieItem accname balance = PieItem (T.unpack accname) offset balance where offset = 0
+accountPieItem accname = PieItem (T.unpack accname) offset where offset = 0
 
 -- | Generate an infinite color list suitable for charts.
 mkColours :: Double -> [AlphaColour Double]
diff --git a/hledger-lib/Hledger/Data/Journal.hs b/hledger-lib/Hledger/Data/Journal.hs
index 414f71042..92c5c67c5 100644
--- a/hledger-lib/Hledger/Data/Journal.hs
+++ b/hledger-lib/Hledger/Data/Journal.hs
@@ -429,8 +429,7 @@ journalAssetAccountQuery j =
 -- or otherwise for accounts with names matched by the case-insensitive 
 -- regular expression @^assets?(:|$)@.
 journalAssetNonCashAccountQuery :: Journal -> Query
-journalAssetNonCashAccountQuery j = 
-  journalAccountTypeQuery [Asset] (toRegexCI' "^assets?(:|$)") j
+journalAssetNonCashAccountQuery = journalAccountTypeQuery [Asset] (toRegexCI' "^assets?(:|$)")
 
 -- | A query for Cash (liquid asset) accounts in this journal, ie accounts
 -- declared as Cash by account directives, or otherwise Asset accounts whose 
@@ -1112,7 +1111,7 @@ commodityStylesFromAmounts =
 -- | Given a list of amount styles (assumed to be from parsed amounts
 -- in a single commodity), in parse order, choose a canonical style.
 canonicalStyleFrom :: [AmountStyle] -> AmountStyle
-canonicalStyleFrom ss = foldl' canonicalStyle amountstyle ss
+canonicalStyleFrom = foldl' canonicalStyle amountstyle
 
 -- TODO: should probably detect and report inconsistencies here.
 -- Though, we don't have the info for a good error message, so maybe elsewhere.
diff --git a/hledger-lib/Hledger/Read/Common.hs b/hledger-lib/Hledger/Read/Common.hs
index b0238d652..2ae328639 100644
--- a/hledger-lib/Hledger/Read/Common.hs
+++ b/hledger-lib/Hledger/Read/Common.hs
@@ -281,14 +281,14 @@ forecastPeriodFromRawOpts d rawopts = do
 -- | Run a text parser in the identity monad. See also: parseWithState.
 runTextParser, rtp
   :: TextParser Identity a -> Text -> Either (ParseErrorBundle Text CustomErr) a
-runTextParser p t =  runParser p "" t
+runTextParser p =  runParser p ""
 rtp = runTextParser
 
 -- | Run a journal parser in some monad. See also: parseWithState.
 runJournalParser, rjp
   :: Monad m
   => JournalParser m a -> Text -> m (Either (ParseErrorBundle Text CustomErr) a)
-runJournalParser p t = runParserT (evalStateT p nulljournal) "" t
+runJournalParser p = runParserT (evalStateT p nulljournal) ""
 rjp = runJournalParser
 
 -- | Run an erroring journal parser in some monad. See also: parseWithState.
diff --git a/hledger-lib/Hledger/Read/CsvReader.hs b/hledger-lib/Hledger/Read/CsvReader.hs
index af45e6de4..d4fe051e3 100644
--- a/hledger-lib/Hledger/Read/CsvReader.hs
+++ b/hledger-lib/Hledger/Read/CsvReader.hs
@@ -170,7 +170,7 @@ addAssignment :: (HledgerFieldName, FieldTemplate) -> CsvRulesParsed -> CsvRules
 addAssignment a r = r{rassignments=a:rassignments r}
 
 setIndexesAndAssignmentsFromList :: [CsvFieldName] -> CsvRulesParsed -> CsvRulesParsed
-setIndexesAndAssignmentsFromList fs r = addAssignmentsFromList fs . setCsvFieldIndexesFromList fs $ r
+setIndexesAndAssignmentsFromList fs = addAssignmentsFromList fs . setCsvFieldIndexesFromList fs
 
 setCsvFieldIndexesFromList :: [CsvFieldName] -> CsvRulesParsed -> CsvRulesParsed
 setCsvFieldIndexesFromList fs r = r{rcsvfieldindexes=zip fs [1..]}
@@ -223,8 +223,7 @@ parseAndValidateCsvRules rulesfile s =
 -- | Parse this text as CSV conversion rules. The file path is for error messages.
 parseCsvRules :: FilePath -> T.Text -> Either (ParseErrorBundle T.Text CustomErr) CsvRules
 -- parseCsvRules rulesfile s = runParser csvrulesfile nullrules{baseAccount=takeBaseName rulesfile} rulesfile s
-parseCsvRules rulesfile s =
-  runParser (evalStateT rulesp defrules) rulesfile s
+parseCsvRules = runParser (evalStateT rulesp defrules)
 
 -- | Return the validated rules, or an error.
 validateRules :: CsvRules -> Either String CsvRules
diff --git a/hledger-lib/Hledger/Reports/ReportOptions.hs b/hledger-lib/Hledger/Reports/ReportOptions.hs
index c5a4b0d2d..3ef2c3a0a 100644
--- a/hledger-lib/Hledger/Reports/ReportOptions.hs
+++ b/hledger-lib/Hledger/Reports/ReportOptions.hs
@@ -710,7 +710,7 @@ instance (e ~ a) => Reportable (Either a) e where
 
 -- | Apply a function over a lens, but report on failure.
 overWithReport :: ((a -> Either e b) -> s -> Either e t) -> (a -> b) -> s -> Either e t
-overWithReport l f s = l (pure . f) s
+overWithReport l f = l (pure . f)
 
 -- | Set a field using a lens, but report on failure.
 setWithReport :: ((a -> Either e b) -> s -> Either e t) -> b -> s -> Either e t
diff --git a/hledger-lib/Hledger/Utils/Debug.hs b/hledger-lib/Hledger/Utils/Debug.hs
index 47f2b3cf1..89099bae3 100644
--- a/hledger-lib/Hledger/Utils/Debug.hs
+++ b/hledger-lib/Hledger/Utils/Debug.hs
@@ -439,5 +439,5 @@ traceParseAt level msg = when (level <= debugLevel) $ traceParse msg
 
 -- | Convenience alias for traceParseAt
 dbgparse :: Int -> String -> TextParser m ()
-dbgparse level msg = traceParseAt level msg
+dbgparse = traceParseAt
 
diff --git a/hledger-lib/Hledger/Utils/Parse.hs b/hledger-lib/Hledger/Utils/Parse.hs
index 00d59450f..9c2c1e3fd 100644
--- a/hledger-lib/Hledger/Utils/Parse.hs
+++ b/hledger-lib/Hledger/Utils/Parse.hs
@@ -95,7 +95,7 @@ parseWithState
   -> StateT st (ParsecT CustomErr Text m) a
   -> Text
   -> m (Either (ParseErrorBundle Text CustomErr) a)
-parseWithState ctx p s = runParserT (evalStateT p ctx) "" s
+parseWithState ctx p = runParserT (evalStateT p ctx) ""
 
 parseWithState'
   :: (Stream s)
@@ -103,7 +103,7 @@ parseWithState'
   -> StateT st (ParsecT e s Identity) a
   -> s
   -> (Either (ParseErrorBundle s e) a)
-parseWithState' ctx p s = runParser (evalStateT p ctx) "" s
+parseWithState' ctx p = runParser (evalStateT p ctx) ""
 
 fromparse
   :: (Show t, Show (Token t), Show e) => Either (ParseErrorBundle t e) a -> a
diff --git a/hledger-lib/Hledger/Utils/Test.hs b/hledger-lib/Hledger/Utils/Test.hs
index 4c4c65225..dcc00c574 100644
--- a/hledger-lib/Hledger/Utils/Test.hs
+++ b/hledger-lib/Hledger/Utils/Test.hs
@@ -80,7 +80,7 @@ assertParse parser input = do
 -- | Assert a parser produces an expected value.
 assertParseEq :: (HasCallStack, Eq a, Show a, Default st) =>
   StateT st (ParsecT CustomErr T.Text IO) a -> T.Text -> a -> Assertion
-assertParseEq parser input expected = assertParseEqOn parser input id expected
+assertParseEq parser input = assertParseEqOn parser input id
 
 -- | Like assertParseEq, but transform the parse result with the given function
 -- before comparing it.
@@ -146,7 +146,7 @@ assertParseEqE
   -> T.Text
   -> a
   -> Assertion
-assertParseEqE parser input expected = assertParseEqOnE parser input id expected
+assertParseEqE parser input = assertParseEqOnE parser input id
 
 assertParseEqOnE
   :: (HasCallStack, Eq b, Show b, Default st)
diff --git a/hledger-lib/Text/Megaparsec/Custom.hs b/hledger-lib/Text/Megaparsec/Custom.hs
index f54272c49..c1bfb8e17 100644
--- a/hledger-lib/Text/Megaparsec/Custom.hs
+++ b/hledger-lib/Text/Megaparsec/Custom.hs
@@ -103,7 +103,7 @@ instance ShowErrorComponent CustomErr where
 -- point).
 
 parseErrorAt :: Int -> String -> CustomErr
-parseErrorAt offset msg = ErrorFailAt offset (offset+1) msg
+parseErrorAt offset = ErrorFailAt offset (offset+1)
 
 -- | Fail at a specific source interval, given by the raw offsets of its
 -- endpoints from the start of the input stream (the numbers of tokens
diff --git a/hledger/Hledger/Cli/CliOptions.hs b/hledger/Hledger/Cli/CliOptions.hs
index 5c17a7cb7..1235c33ee 100644
--- a/hledger/Hledger/Cli/CliOptions.hs
+++ b/hledger/Hledger/Cli/CliOptions.hs
@@ -242,7 +242,7 @@ commodityStyleFlag = flagReq
     ("Override the commodity style in the output for the specified commodity. For example 'EUR1.000,00'.")
 
 argsFlag :: FlagHelp -> Arg RawOpts
-argsFlag desc = flagArg (\s opts -> Right $ setopt "args" s opts) desc
+argsFlag = flagArg (\s opts -> Right $ setopt "args" s opts)
 
 generalflagstitle :: String
 generalflagstitle = "\nGeneral flags"
diff --git a/tools/generatejournal.hs b/tools/generatejournal.hs
index 609443726..93aa92993 100755
--- a/tools/generatejournal.hs
+++ b/tools/generatejournal.hs
@@ -49,7 +49,7 @@ showtxn txnno date acct1 acct2 comm pricecomm =
       rate = 0.70 + 0.01 * fromIntegral (txnno `rem` 60) :: Decimal
 
 showmarketprice :: Day -> Double -> String
-showmarketprice date rate = printf "P %s A  %.2f B\n" (show date) rate
+showmarketprice date = printf "P %s A  %.2f B\n" (show date)
 
 uniqueAccountNames :: [String] -> Int -> [String]
 uniqueAccountNames opts depth =