tax-ato: project update (lightning talk, EO2025)

A brief update to the tax-ato project, an Australian personal income tax library written in Haskell.

Transcript

1. tax-ato: project update Fraser Tweedale @hackuador@functional.cafe 2025-01-22
3. tax-ato - personal income tax library yes it’s Haskell of course, sorry not sorry https://hackage.haskell.org/package/tax-ato https://github.com/frasertweedale/hs-tax-ato
4. import Control.Lens import Data.Time import Text.PrettyPrint (render) import Data.Tax.ATO import Data.Tax.ATO.CGT import Data.Tax.ATO.Pretty import qualified Data.Tax.ATO.FY.FY2024 as FY main :: IO () main = do let assessment = assessTax FY.tables taxReturn putStrLn . render $ summariseTaxReturnInfo taxReturn putStrLn . render $ summariseAssessment assessment taxReturn :: TaxReturnInfo FY.FY Rational taxReturn = newTaxReturnInfo & set paymentSummaries [ PaymentSummary "1234567890" -- ABN (Money 180000) -- Gross payments (Money 50000) -- Tax withheld mempty -- Reportable super contributions ] & set dividends [ dividendFromNetFranked30 -- 30% corporate tax rate "IBM" (day "2023-09-01") -- payment date (Money 70) -- net payment (proportion 1) -- franked proportion ] & set cgtEvents [ CGTEvent "NVDA" -- ticker 10 -- units (may be fractional) (day "2014-01-01") -- acquisition date (Money 30) -- acquisition price (per unit) (Money 20) -- acquisition cost (brokerage) (day "2024-03-01") -- disposal date (Money 300) -- disposal price (Money 20) -- disposal cost mempty -- capital costs mempty -- costs of ownership ] & set (deductions . workRelatedTravelExpenses) (Money 1000) & set (deductions . personalSuperannuationContributions) (Money 5000) & set helpBalance (Money 10000) & set privateHealthInsurancePolicyDetails [ PrivateHealthInsurancePolicyDetail "NIB" "98765432" -- policy number (Money 750) -- premiums eligible for rebate (Money 180) -- rebate received BenefitCode30 , PrivateHealthInsurancePolicyDetail "NIB" "98765432" (Money 250) (Money 60) BenefitCode31 ]
5. stuff that was implemented in 2023 ▶ PAYG income, deductions ▶ Medicare levy, Medicare levy surcharge ▶ dividends and franking credits ▶ CGT, foreign income, FITO, ESS ▶ student loan repayments (HECS/HELP/etc) ▶ offsets: LITO, LMITO, spouse super contribution ▶ private health insurance rebate adjustments ▶ rates/rules for previous financial years (back to 2017)
6. stuff that’s new since 2023 ▶ PAYG instalments ▶ depreciation schedules ▶ pretty printing ▶ improvements to dividends ▶ vastly expanded documentation and examples
7. stuff that I SHALL implement this year ▶ personal services income (PSI) ▶ trust distributions ▶ cents-per-kilometer travel expense rates ▶ WFH running costs cents-per-hour rates
8. stuff that’s still not implemented ▶ some adjustments/variations based on family income or dependents ▶ employment termination payments ▶ super income streams and lump payments ▶ rental income and deductions ▶ FHSS releases ▶ some grandfathering rules (e.g. CGT indexation method) ▶ lots of other esoteric (to me) features and quirks
9. want to contribute? (low-hanging fruit) ▶ rental income and deductions ▶ pre-2017 rates and thresholds ▶ tests ▶ scratch your own itch...
10. give it a go, let me know what’s missing
11. © 2025 Fraser Tweedale Except where otherwise noted this work is licensed under http://creativecommons.org/licenses/by/4.0/ Code https://github.com/frasertweedale Blog frasertweedale.github.io/blog-fp Fediverse @hackuador@functional.cafe