Move Your Paper Ledger to a Billing App: A 7-Day Plan

The hardest part of switching from a notebook to a billing app is often deciding where the old records end and the new ones begin. A clear cut-off date prevents opening balances from being counted again as new sales or purchases.

This seven-day plan is a suggested evaluation schedule. Take longer if your records need reconciliation. Correct opening figures matter more than finishing quickly.

Agree a starting date, preserve the old records and verify opening balances before relying on the app.

Day 1: choose the starting point

Pick the date from which the app will become your record for new transactions. Save dated copies or photos of the old records. List what you need to bring forward: products, quantities, customer dues and supplier balances.

Day 2: count a small product group

Start with fast-moving items you can count. Record the exact unit and opening quantity at the cut-off. Separate goods received after that point so you do not count them both in opening stock and a new purchase.

Day 3: reconcile customer balances

For each initial customer, confirm the balance from old bills, payments and agreed adjustments. Where there is a dispute, keep the difference visible. Do not create a fresh sale solely to reproduce an old receivable.

Day 4: reconcile supplier balances

Use supplier statements to compare outstanding bills and payments. A single total without its references is harder to investigate later. See the supplier reconciliation worksheet for a worked example.

Day 5: set up and test DAM

Search Add Product to enter checked quantities through Opening Qty. Search Add Party to set up customer or supplier records. Confirm the supported opening-balance workflow in your app version before adding the old amounts.

Search New Sale and New Purchase to test new transactions. Use Sales Invoices, Purchase Invoices and Stock Report to compare the resulting records with your expected figures.

Day 6: run a small parallel check

For the pilot group, record references clearly and compare the app with your check sheet at the end of the day. This is a temporary verification process, not a reason to maintain two competing ledgers indefinitely.

Review one cash sale, one credit sale, one later receipt and one supplier purchase. Resolve differences before expanding to all products and parties.

Day 7: review and decide

Can the person at the counter find an old bill? Can you explain stock and party balances? Are corrections manageable? If yes, expand carefully and mark the agreed cut-off in the old ledger. If not, keep the pilot small and fix the problem first.

Should I enter years of old invoices?

That depends on reporting needs and the app's supported migration workflow. Agree it with your accountant and support team; a verified opening balance may serve a different purpose from detailed historic transactions.

Can I throw away the notebook?

Keep the old records according to the requirements that apply to your business. The app's new records do not automatically replace every historic document.

What if we discover a starting-balance mistake?

Document the difference and use the supported correction process. Recheck the party or stock balance; do not hide it inside an unrelated transaction.

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