Skip to content
Nika

Startup Bookkeeping Checklist: First 90 Days

A startup bookkeeping checklist for the first 90 days covers four stages: set up the legal and tax foundation in week one, open the right bank accounts and choose accounting tools in weeks two to four, establish the invoice and expense routine by day 60, and reconcile and review before the first VAT or tax deadline at day 90. The biggest mistake new businesses make is deferring bookkeeping until the first tax deadline — by then, three months of untracked invoices and expenses are a costly reconstruction. Starting the routine on day one is cheaper than rebuilding it on day ninety.

Most founders treat bookkeeping as something to set up "later" — after the product, the customers, the revenue. The result is always the same: three months in, no one can find the incorporation invoice, expenses are spread across personal cards, and the first VAT deadline becomes a weekend of reconstruction. This checklist is the minimum setup and routine that prevents that. It is designed for the first 90 days of a new business, when the volume is low and the habits are still forming. Doing it now costs hours; rebuilding it later costs days.

Week 1 — Foundation

  • Register the business entity and obtain a tax identification number

    Without a registered entity and tax ID, every subsequent step — bank account, invoicing, VAT registration — is blocked. This is the foundation that determines your legal form, tax obligations, and personal liability. Getting it right in week one prevents restructuring costs later.

  • Register for VAT if your expected turnover crosses the threshold or you plan cross-border trade

    VAT registration is not always mandatory on day one, but if you will trade internationally or expect to cross the threshold quickly, registering early lets you reclaim VAT on startup costs — equipment, software, professional fees — that you would otherwise lose. Waiting means burning deductions you are entitled to.

Weeks 2-4 — Accounts & tools

  • Open a dedicated business bank account separate from personal finances

    Mixing personal and business transactions is the single most common startup bookkeeping failure. It makes reconciliation impossible, muddies your tax position, and in some jurisdictions pierces the corporate veil — exposing personal assets. A separate account costs nothing and prevents a class of problems that are expensive to untangle later.

  • Choose and set up accounting software or a bookkeeping system

    A system chosen in the first month — even a simple one — means every transaction from day one is captured. Choosing later means reconstructing the first weeks from memory and bank statements, which is slow and error-prone. The system can be upgraded later; what matters is that it exists from the start.

  • Set up a dedicated invoice inbox from day one

    A single address that all supplier invoices are routed to is the foundation of automated processing. It means Nika (or whoever processes invoices) watches one place instead of hunting across personal emails, WhatsApp, and a paper tray. Setting it up on day one means no invoice is ever lost to a personal inbox.

Days 30-60 — Establish the routine

  • Begin tracking every business expense, even small ones, from day one

    Small expenses missed in the first two months are the most common source of understated deductions at the first tax filing. Tracking from day one — through a card, an app, or per-receipt processing from {price} per receipt — means nothing is lost and the first filing is accurate without reconstruction.

  • Enter and file every supplier invoice the day it arrives

    A 30-day backlog of invoices takes a full day to clear; a daily routine takes minutes. Entering invoices daily — or letting Nika do it from {price} per processed invoice — keeps the books current and prevents the first VAT deadline from becoming a scramble.

  • Set up a payroll or contractor-payment process if you have team members

    Even one team member creates payroll or contractor-payment obligations. Setting up the process early — software, a provider, or a clear contractor workflow — prevents the first pay run from being a manual, error-prone scramble. Late or incorrect pay runs damage trust and create compliance risk.

Days 60-90 — Reconcile & review

  • Reconcile the bank account against the books for the first time

    The first reconciliation is where missing transactions, uncategorised expenses, and duplicate entries surface. Doing it at day 60 — when the volume is still small — turns it into a quick check. Deferring it to day 90 or the first tax deadline turns it into a half-day reconstruction.

  • Review the first VAT or tax position well before the filing deadline

    The first filing is the one most likely to contain errors, because the routines are new and the books are shallow. Reviewing days before the deadline — not the day of — leaves time to fix issues. A clean first filing sets the pattern; a rushed one creates cleanup that compounds.

How Nika helps

Nika handles the invoice half of this checklist from day one. She watches the dedicated invoice inbox, enters every supplier invoice the day it arrives, flags duplicates and unusual VAT, and files every document digitally. From {price} per processed invoice, a startup gets clean books from the first week — without hiring a bookkeeper or spending founder time on data entry. The setup, the payroll, and the tax filings stay with the founder and their accountant; the invoice routine is Nika's.

Questions

When should a startup start doing bookkeeping?

On day one — not after the first revenue, not after the first tax deadline. The first week of operations generates invoices, expenses, and transactions that need to be captured. Starting the routine on day one costs hours; rebuilding it on day ninety costs days. Per-invoice processing at {price} per invoice means the books are current from week one without founder time.

Does a startup need an accountant in the first 90 days?

Not necessarily in-house, but at least for setup: choosing the entity, registering for VAT, and confirming local tax obligations. A light-touch accountant or advisor for setup, plus per-invoice AI processing from {price} per processed invoice for the daily routine, is typically the right split for a new business. A full-time bookkeeper is rarely justified until transaction volume is consistently high.

Automate this with Nika

Other checklists