FY2021.hs

-- This file is part of hs-tax-ato
-- Copyright (C) 2020, 2021  Fraser Tweedale
--
-- hs-tax-ato is free software: you can redistribute it and/or modify
-- it under the terms of the GNU Affero General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-- GNU Affero General Public License for more details.
--
-- You should have received a copy of the GNU Affero General Public License
-- along with this program.  If not, see <http://www.gnu.org/licenses/>.

{-# LANGUAGE DataKinds #-}

-- | Tax tables for 2020–21 financial year.
module Data.Tax.ATO.FY.FY2021 (FY, fyProxy, tables, individualIncomeTax) where

import Data.Proxy
import Control.Lens (review)

import Data.Tax
import Data.Tax.ATO.Common
import Data.Tax.ATO.PrivateHealthInsuranceRebate
import qualified Data.Tax.ATO.FY.FY2020 as FY2020

type FY = 2021
fyProxy :: Proxy FY
fyProxy = Proxy

-- | In 2020–21 the 32.5% threshold was increased from $37,000 to
-- $45,000, and the 37% threshold was increased from $90,000 to
-- $120,000.
individualIncomeTax :: (Fractional a, Ord a) => Tax (Money a) (Money a)
individualIncomeTax = marginal'
  [ (18200, 0.19)
  , (45000, 0.325 - 0.19)
  , (120000, 0.37 - 0.325)
  , (180000, 0.45 - 0.37) ]

help :: (Fractional a, Ord a) => Tax (Money a) (Money a)
help = thresholds'
  [ (46620, 0.01)
  , (53827, 0.01)
  , (57056, 0.005)
  , (60480, 0.005)
  , (64109, 0.005)
  , (67955, 0.005)
  , (72032, 0.005)
  , (76355, 0.005)
  , (80936, 0.005)
  , (85793, 0.005)
  , (90940, 0.005)
  , (96397, 0.005)
  , (102180, 0.005)
  , (108310, 0.005)
  , (114708, 0.005)
  , (121699, 0.005)
  , (129000, 0.005)
  , (136740, 0.005)
  ]

tables :: (Ord a, Fractional a) => TaxTables FY a
tables = TaxTables
  individualIncomeTax
  (medicareLevy (review money 23226))
  (ttMedicareLevySurcharge FY2020.tables)
  help
  help
  (lowIncomeTaxOffset2021 <> lamito)
  privateHealthInsuranceRebateRates

privateHealthInsuranceRebateRates
  :: (Fractional a) => PrivateHealthInsuranceRebateRates a
privateHealthInsuranceRebateRates =
  [ ( 90000, (0.25059, 0.24608), (0.29236, 0.28710), (0.33413, 0.32812) )
  , (105000, (0.16706, 0.16405), (0.20883, 0.20507), (0.25059, 0.24608) )
  , (140000, (0.08352, 0.08202), (0.12529, 0.12303), (0.16706, 0.16405) )
  ]