Self Assessment Tax Returns

Compare self assessment accountants from £10/month — SA100 returns for sole traders, landlords and directors. Get matched before the January deadline.

Self Assessment is HMRC's system for reporting income not taxed at source. Sole traders, landlords, company directors, and partners must file by 31 January. Late filing penalties start at £100. An accountant ensures allowable expenses are claimed and payments on account are calculated correctly.

Do I need an accountant for Self Assessment?

You are not legally required to hire one. File yourself if you have one simple income stream, tidy records, and will hit 31 January. Hire one if you have mixed income, rental property, a company dividend, or a history of late filing — the first £100 penalty already covers a cheap return.

The online deadline is 31 January following the tax year that ended on 5 April. Paper filing is earlier. Payments on account can surprise first-time filers. MTD for Income Tax from April 2026 adds quarterly digital updates for qualifying sole traders and landlords — a January-only relationship may not be enough once that starts.

How much does a self assessment accountant charge?

A standalone Self Assessment return typically costs £150–£350 per year. Bundled into a monthly sole-trader or director package it often looks like £10–£25 per month on our editorial benchmarks. Confirm whether the quote includes the SA100 only or also supplementary pages.

Landlords, capital gains and foreign income add pages and add fees. Do not compare a SA100-only quote with a full sole-trader package. Use the fee estimator, then three written quotes on the same scope.

Typical cost

£10/mo – £25/mo

How much does a self assessment accountant charge?▼

A standalone Self Assessment return typically costs £150–£350 per year. It is often bundled into monthly sole trader or director packages.

Information only — not tax, accountancy, or financial advice. Rules and thresholds change; confirm current positions with GOV.UK or a qualified accountant. Last updated 17 July 2026.