Additions to the list of open source tax projects, and changes to the map. https://tax-oss.com/feed.xml 2026-10-17T00:00:00Z tax-oss.com CC BY 4.0 tag:tax-oss.com,2026:changes/2026-10-17-dead-links 2026-10-17T00:00:00Z

ANTON's transfer pricing modules, the US Sales Tax Rates Dataset and CustomsIQ were removed because their repositories are no longer public. Transfer pricing stays partly covered and indirect tax stays covered. Four links to folders or repositories that had moved now point to their new places, and one repository archived by its maintainer carries the label.

tag:tax-oss.com,2026:changes/2026-10-09-pages 2026-10-09T00:00:00Z

Each of the 736 entries now has a page with its facts, notes, place on the map and the Learn pages that name it, and each of the 35 activities has one with its read, its projects and its brief. The list can be browsed by tax area, jurisdiction and kind.

tag:tax-oss.com,2026:changes/2026-10-09-map-first 2026-10-09T00:00:00Z

The story now runs Map, Projects, Gaps, Learn: where tax work happens and by whom, what is open for it, what is missing, how to build it. The gaps page lists the partly covered activities too, with what is still missing.

tag:tax-oss.com,2026:changes/2026-10-07-research 2026-10-07T00:00:00Z

55 replication packages, research datasets and data portals are listed as tax datasets, 10 of them on the map, each with its record's latest version as its last update. Packages written for confidential data stay out.

tag:tax-oss.com,2026:changes/2026-10-07-third-sweep 2026-10-07T00:00:00Z

A third sweep found 110 projects. Returns processing, payments and debt collection, and clearance platforms are now partly covered on the authority side; tax accounting, international tax, M&A and tax risk management on the company side. Three company gaps remain: forecasting, planning and controls.

tag:tax-oss.com,2026:changes/2026-10-06-second-sweep 2026-10-06T00:00:00Z

A second sweep over Pillar Two, country-by-country reporting, exchange of information and customs found 218 candidates; 135 joined the list, 72 of them on the map. An authority's several repositories for one service are listed as one entry.

tag:tax-oss.com,2026:changes/2026-10-06-first-sweep 2026-10-06T00:00:00Z

A first sweep over Pillar Two, country-by-country reporting and exchange of information added 18 projects, five of them on the map, and the exchange of information activity gained its first open tool.

tag:tax-oss.com,2026:changes/2026-10-06-transfer-pricing 2026-10-06T00:00:00Z

65 transfer pricing tools, skills and plugins joined the list, 31 of them on the map. Transfer pricing, Pillar Two and transparency and external reporting moved from gap to partly covered, each with a read that says what is still missing.

tag:tax-oss.com,2026:changes/2026-10-06-notes 2026-10-06T00:00:00Z

Entries carry two or three sentences read from their README on the day the facts were checked: what the tool does, what it needs, what to check. They show in the expanded row on the list, on each project's page and in the downloads.

tag:tax-oss.com,2026:changes/2026-10-06-start-with 2026-10-06T00:00:00Z

Every covered and partly covered activity shows its honest read and a start-with line: one or two projects and one sentence why, chosen for maintenance, licence and fit.

tag:tax-oss.com,2026:changes/2026-10-06-learn 2026-10-06T00:00:00Z

The glossary adds the tax-technical terms a reader meets in open tooling, each with examples from the list. Five how-to guides name only listed tools: checking a VAT number from an agent, reading official guidance as data, filing a UK corporation tax return from the command line, drafting a Master File, running a policy simulation.

tag:tax-oss.com,2026:changes/2026-10-06-licences 2026-10-06T00:00:00Z

Entries without a licence we could recognise, entries that allow only non-commercial use, and source-available entries with limits on reuse each carry a badge and a note. The counts on the list come from the data.

tag:tax-oss.com,2026:changes/2026-10-06-refresh 2026-10-06T00:00:00Z

A script re-reads every GitHub entry's last commit, archive flag and stars once a month and proposes the changes; a person reviews them before they reach the site. The first run is due on 1 November 2026.

tag:tax-oss.com,2026:added/2026-10 2026-10-06T00:00:00Z

298 entries joined the list in Oct 2026, as of 2026-10-06: 12_taxobservatory, accounting-harness, ADVANCE-TAX-INTEREST-CALCULATOR, aeoi, aeoi (UEk), aeoi-editor, AfCFTA_Rules_of_Origin, afcfta-rules-of-origin-navigator, Agent-Based Simulation of International Tax Compliance, ALEF (Belastingdienst), apparel-hs-codes, Are Spanish companies involved in profit shifting? (data), ASC-740-SKILL, asc740-tax-provision, Assets in Periphery (Garcia-Bernardo, Stausholm) data, Atlas of the Offshore World (data downloads), bank_retenue_sync, basic-python-tariff-query, bdtariff, before-you-pay, borderlogix-hs-engine, ca-erpnext-zra, CACAO (IDB), caseflow, cbam-api, cbamtools, CBCR (Dan-Kolar), CbCR_to_Excel (Hugging Face Space), cbcr-foundry-raw, chapter_99_traversal, China in Tax Havens (replication), chinaport-data-signature, CIAT Tax Treaty Database, CIT24, Clasificode, claude-trade-skills, code_tcja_profit_shifting, common-reporting-standard, ConvertidorXmlFatca, Corporate tax database (Todtenhaupt), Corporation-Accounting-Skill, cptpp-project, cross_rulings_hts_dataset_for_tariffs, crs-lint, crs-xml-converter, customs-api (Maldives), Customs-Calculator, Customs-Declaration-Datasets, customs-domain, customs-duty-calculator (ShahinHasanov90), customs-mcp-server (yak33), Customs-Valuation, customs-valuation-engine, dac7-validator, dbs_empirical_analysis, deep-agentic-supply-chain-ai (Hugging Face Space), deferred-tax-agent, DGFiP ALTO3, DGFiP calculette-ir, DGFiP CAPROMAS, DGFiP CFE, DGFiP CVAE, DGFiP FARITAS, DGFiP IFER, DGFiP ir-catala, DGFiP taxe d'habitation, DGFiP taxe foncière, DGFiP Test Compta Demat, dibp.actc, DocumentAnalyserAPI, Domibus, douanecode-mcp, DouaneXtract, download-CDS-files, Dutch Peppol Authority validation, Egyptian-eInvoicing (mohamedelareeg), EInvoicingSigner, eori (PHP), eori-validator, ETR_GMT_replication (World Bank), EU Tax Observatory CbC reports (Data For Good), EU Tax Observatory tax deficit report (code and data), eu.idempiere.intrastat, export-declaration-quality-checker, F24EP Ravvedimento Operoso 2.0, fatca (larh76), fatca-data-preparation, fatca-ides-php, fatca-viewer, FATCA-XML-Reporting, fatcacrs, FATCAXMLBatcher, finance-automation-toolkit (Chezhira), financeskills: deferred tax skill, fiscalize (grunt-it), GAAP-Implementation-Toolkit, gdt-invoice-hub, gemma4-hscode-classifier, Generation of machine-readable CbC reports with LLMs (Yusyn) data, Global profit shifting from CbCR micro data (Fuest et al.), global-tax-treaty-network, Harmonized Tariff Schedule of the United States 2025, harmonized_tariff, harvey-labs (Legal Agent Benchmark), HMRC Advance Tariff Rulings service, HMRC Assist (Self Assessment), HMRC CDS Financials, HMRC CRS/FATCA reporting service, HMRC Customs Declaration Service APIs, HMRC Customs Exports Declaration Service, HMRC customs inventory linking APIs, HMRC DAC6 disclosure service, HMRC Digital Platform Reporting service, HMRC Enhanced Self Serve Time To Pay, HMRC EORI services, HMRC EU VAT refunds, HMRC financial transactions (VAT), HMRC Import Control System (ICS2), HMRC individuals charges API, HMRC Mandatory Disclosure Rules service, HMRC New Computerised Transit System (NCTS), HMRC payments services, HMRC penalties service, HMRC Self Assessment accounts API, HMRC Self Assessment calculation APIs, HMRC Self Assessment refund, HMRC Senior Accounting Officer service, HMRC submission tracker, HMRC third-party payments API, HMRC Time to Pay, HMRC VAT repayment tracker, HMRC View and change income tax (MTD), hmrc-exchange-rates, hmrclib, How Much MNCs Pay in Taxes (Godar) replication, hs-code (ronnieaban), hs-code-classifier (ShahinHasanov90), hs-code-classifier-en (Kenpache), hs-code-classifier-mcp-server, hs-code-lookup, hs-code-lookup (AccioWork), HS-Code-Lookup-for-Customs, hscode (Go), hscode-classifier-en (ENTUM-AI), hscode-worksheet-extension, hscodeclassify, HSCodeComp, HSKN, HSN-Code-Package, hstc-api, hts (Analytics Everywhere Lab), HTS-Classifier, htsdata, hyperway, import_tax_calculator, Impot-Calculateur, Income-Tax-Interest-Calculator (aisumitb), indonesia-tax-calculator, inregola, International Technology Licensing, IP Rights and Tax Havens (Santacreu) replication, IRS EITC Assistant, IRS Fact Graph, IRS Form Builder, IRS IDES data preparation samples, IRS Tax Withholding Estimator, israeli-tax-withholding, Japanese-English translation of contents HS codes, java-email-parser, Kenya Compliance (navari), Knocking on Tax Haven's Door (replication), kra-etims-api-integration, KSeF official clients (C#, Java), KSeF PDF generator, Long way to tax transparency (Godar) replication, mcp-hts, MergeRiskAI, Mews.Fiscalizations, Mlang, MNCs and Tax Havens: CbCR (Garcia-Bernardo, Janský, Tørsløv), Monitoring Tax Compliance by MNEs: Chile (Bustos et al.) data, Multinationals' Sales and Profit Shifting in Tax Havens (data and code), myinvois-gateway, national-trade-forensics, NAV eRECEIPT, NAV eVAT, NAV M2M, NAV M2M XML editor, NAV Online Cash Register logfile, NAV Online Invoice, NAV SAF-T HU, nepal-hs-code-finder, nepal-knitwear-sourcing-tools, node-unipass, nomenclator, OCA intrastat-extrastat, Offshore Profit Shifting and Aggregate Measurement (data and code), Offshore_Profit_Shifting_Replication.jl, open-logistics-tools, openade, openschedule, openswissdata, originshift, ott-agent, Oxalis, Oxalis-NG, permanent-establishment-hub, Phantom FDI database (Damgaard, Elkjaer, Johannesen), phase4, phd_thesis_rep (Heitmüller), phoss AP, phoss SMP, pillar-two-instruct, pillar2 (risk dashboard), Pillar2_New_Working, preference-utilisation-analysis, product_hscode, Profit shifting and revenue losses (Janský, Palanský) replication, Profit Shifting in a Globalized World (Dharmapala) data, profit-shifting-explorer, replication_cbcr (formulary apportionment), roo-table-extractor, Royalty Taxation under Tax Competition (Juranek et al.) data, rules-of-origin-builder-uk, rules-of-origin-builder-xi, Rules-of-Origin-Extractor, Scsl.Math.Customs, Searching for Profit-Shifting in China (replication), section382, SEZs and BEPS Action 5 (Heitmüller, Mosquera), Skatteetaten mva-meldingen, Skatteetaten SAF-T, Skatteetaten skattemeldingen, Skatteetaten trekktabell, Skattestyrelsen RSU B2B sample clients, sovereign-risk-platform, stata-project-profit-shifting, sydonia-toolkit, synthetic_tariff_classification_products_kr, TaMaTo (Tariff Management Tool), taric-gemini, taric-opendata, tariff-engine, tariff-everywhere, tariff-resolver, tariffai, tariffs-profit-shifting, Task004-payments-tax-governance-cockpit, Tax Compliance and Transfer Pricing survey (TRR 266), Tax Justice Network Data Portal, Tax Observatory CbCR extraction demo, Tax Treaty Overview (Taiwan Ministry of Finance), tax-extension-payment-calculator, tax-interest-calculator (nieinter), tax-mind, tax-penalty-calculator (Sivkov77), tax-position-risk-prototype, tax-provision (Ritesh123423), Tax-Provision-Agent, Tax-Provision-Day-17-of-30, tax-treaties (LuckStock), tax-treaty-agent, TaxBench, TaxGraph, Taxing across Borders (Zucman) data, taxpro-uk, TaxProvision (Singapore), Territorial Tax Reform and Profit Shifting (Hasegawa) replication, thai-customs-tariff-json, The Missing Profits of Nations (replication), TNVED_BOT, trade-classify, Trade-IFF, Trade-misinvoicing estimator replication, trade-tariff-classification-examples, Transfer Pricing by Multinational Firms (Cristea, Nguyen) data, TransferPricingSurvey (TRR 266), trytond-customs, tw-tax-penalty-calc, UK Online Trade Tariff, UK Trade Tariff AI search evaluation suite, UK Trade Tariff duty calculator, UK Trade Tariff FPO commodity search, UK Trade Tariff MCP server, unitary-taxation (Tax Justice Network), ura-efris-php-sdk, us-dividend-wht, us-hts-classifier, us-import-duty-hs6, us-tariff-data, vat-penalty-calc (Korea), vynfi-group-audit-enterprise-2000, Withholding-Tax-Rates-2026, XMLFileGenerator, yapay-zeka-gtip-tespiti, zimra-fdms, zoll-api (bund.dev), Zolltarif-Validator-JavaFX, ZRA-SMARTX.

tag:tax-oss.com,2026:changes/2026-10-05-every-project 2026-10-05T00:00:00Z

The list opened to every open source tax project: personal-tax tools, inactive and archived repositories, demos and clients for a paid service are listed with a label that says what to check. Only maintained projects for companies and tax authorities sit on the map.