Begin bookkeeping the moment the first transaction hits the business account. Founders who wait until tax season or an investor's due diligence request typically find themselves rebuilding bank entries, invoices, expenses, GST records, payroll runs, and founder contributions from fragmented memory — a painful and error-prone exercise that monthly discipline would have prevented.
A steady monthly rhythm makes the business readable at any point in the year.
Set up the accounting base
Before the first month-end close, put the structural pieces in place. Define a chart of accounts, agree on an invoice-numbering sequence, label expense categories clearly, list all bank accounts, create a customer and vendor master, set payroll categories, and create document folders — one for each major category. Assign responsibility: who uploads documents, and who signs off on the books each month. This clarity prevents gaps when staff changes or the CA asks a question mid-year.
Monthly close
The monthly close is where scattered transactions become actual financial records. Work through each area systematically:
- Reconcile all bank accounts against the statements.
- Post and review sales invoices and receipts.
- Match purchase bills against payments.
- Record expenses with supporting documents.
- Update loan ledgers for EMI and interest.
- Capture owner contributions and drawings.
- Prepare GST working where the business is GST-registered.
- Run TDS working if applicable.
- Close payroll for the month.
- Reconcile receivables and payables.
When something does not reconcile, note it explicitly rather than parking it in a suspense account. Suspense entries that are ignored become audit queries later.
MIS reporting
Once the books are closed, distil the numbers into a short monthly note for management. Cover revenue for the period, gross and net margins, closing cash balance, outstanding receivables, payables that are due, statutory dues for the month, any large or unusual expenses, and open questions that need a decision. The purpose is to surface problems while they are still small — not to produce a document that sits unread.
Founders and directors who read their MIS monthly tend to catch cash-flow issues, billing gaps, and GST mismatches well before they become serious.
Records to lock after each close
A closed month should be reproducible without asking the founder to remember what happened. Save the final bank reconciliation, sales and purchase registers, expense ledger, payroll summary, GST and TDS working where applicable, loan schedule, receivables and payables ageing, and the management note. Keep source invoices and payment proof in a folder structure that matches the ledger period. Restrict later edits to an identified person and record why a closed entry changed.
This archive matters when the business prepares a GST return, annual financial statements, an income-tax return, a lender application, or an investor data room. The next reviewer should be able to move from a reported figure back to the transaction and supporting document.
Escalate issues before they roll forward
Do not carry a mismatch into the next month merely because the amount looks small. Escalate when a bank balance does not reconcile, an invoice lacks supporting proof, GST treatment is uncertain, TDS may have been missed, payroll records conflict, a loan ledger does not match the lender statement, or owner and business transactions are mixed. Assign an owner and deadline to every open item in the monthly note.
At quarter-end, review recurring mismatches, ageing receivables, overdue statutory payments, unusual expenses, and negative cash-flow trends. These patterns often reveal a process problem that a single monthly close cannot solve.
Frequently asked questions
When should a startup start bookkeeping?
Start as soon as transactions begin. Early bookkeeping prevents later reconstruction of bank, invoice, expense, payroll, GST, and funding records.
For monthly bookkeeping, what should be closed every month?
Close sales, purchases, expenses, bank reconciliation, GST or TDS working where applicable, payroll, loan records, and management notes.
Is bookkeeping only for tax filing?
No. It supports cash flow, funding, audit readiness, GST, TDS, payroll, owner decisions, and customer or vendor disputes.