Income records
Sales invoices, till or app summaries and bank credits. Keeping business income separate from personal funds makes reconciliation far quicker.
Sole traders
Working as a sole trader keeps administration light, but the tax position still needs care — particularly around expenses, National Insurance and payments on account.
New tax year begins; the previous year's figures can be finalised.
Deadline to register for Self Assessment after starting to trade.
Online return, balancing payment and first payment on account due.
Second payment on account due where applicable.
Sales invoices, till or app summaries and bank credits. Keeping business income separate from personal funds makes reconciliation far quicker.
Receipts and invoices for materials, tools, insurance, professional fees, subscriptions and travel. Digital copies are acceptable provided they are legible and retained.
Either a reasonable apportionment of actual costs or HMRC's simplified flat rates. Mileage logs support the per-mile method where a vehicle is used for both business and private journeys.