Side Hustle Tax Calculator 2025/26

Description

If your side hustle generates more than £1,000 a year in sales, our excel spreadsheet side hustle tax calculator can track sales, whilst estimating the tax and national insurance liability. Designed for the 2025/26 tax year, the spreadsheet analyses sales by product, platform and payment type. The tax and national insurance liability are calculated on a cumulative monthly basis, incorporating both employment income and side hustle profits. Providing a more accurate estimate of your side hustle tax liability, the spreadsheet helps ensure you have sufficient funds set aside to cover the tax and national insurance liability.

With the spreadsheet, you can track sales by product, platform and payment type, with figures and charts. You can analyse business expenses too. The spreadsheet includes a section that summarises the sales, expenses and net profit by month and quarter. The tax estimates consist of two calculations, one deducts the trading allowance from the sales, whilst the other deducts business expenses. This lets you determine which option is the most tax beneficial. This product is suitable for the financial tax year 2025/26 (April 25 to March 26).

The product includes instructions and information about the £1,000 annual trading allowance and submitting self assessment tax returns to HMRC.