The guides
Long-form, carefully sourced walkthroughs of the tax and filing rules that actually affect you — written so a normal human can follow them, and kept current with the latest rates.
Making Tax Digital for Income Tax: the complete guide
Who is in scope, the April 2026/2027/2028 timeline, quarterly updates, the Final Declaration and the new penalty regime.
Self Assessment: the complete guide
Who must file, registration and deadlines, payments on account, the supplementary pages, penalties and the 2025-26 allowances.
Corporation Tax & the CT600: a director's guide
Rates, marginal relief, associated companies, capital allowances, losses, R&D relief and the deadlines every limited company must hit.
Companies House filing: accounts, confirmation statements & ECCTA
The three things every company must file, the new 2025 size thresholds, deadlines, late-filing penalties and the identity-verification changes now live.
Pension tax relief & allowances: the complete guide
How relief actually reaches your pension, the £60,000 annual allowance and taper, carry forward, and life after the Lifetime Allowance.
US federal income tax: a 2025–2026 guide
Brackets and the standard deduction, marginal vs effective rates, FICA, retirement accounts, capital gains and the OBBBA changes.
US retirement accounts: the complete guide
401(k), IRA, HSA and the rest — limits, phase-outs, the SECURE 2.0 super catch-up and OBBBA changes for 2026.
US capital gains: long-term, short-term, NIIT & harvesting
The 0/15/20% rates, the unindexed 3.8% NIIT, qualified dividends, the wash-sale rule and tax-loss harvesting.
US state income tax: who taxes what
The nine no-tax states, flat vs graduated rates, who actually gets to tax you, the remote-work convenience rule, and the SALT cap after the One Big Beautiful Bill.
UK ↔ US tax: a cross-border guide
Citizenship-based taxation, the FEIE vs the Foreign Tax Credit, FBAR & FATCA, the PFIC and ISA traps, pensions, and how to come into compliance.