The reason most small-business books are three months behind isn't laziness — it's that manual entry competes with running the business, and loses. But in India, almost every business payment already generates a text: a bank SMS for account debits/credits, or a notification from GPay/PhonePe/Paytm. Your books can write themselves from those.
An Android app with SMS and notification-listening permissions can read each incoming bank message, extract the amount, direction (debited/credited), reference number and counterparty, and record it as an entry — the moment it happens. OTPs, balance alerts, EMI reminders and promotional messages are filtered out by pattern. When the same payment produces both an SMS and an app notification, reference-number matching keeps it as one entry, not two.
Because capture is automatic, your only job is tagging. Once a day — many contractors fold it into an evening review — open the untagged list and give each entry three taps: a category (fuel, material, labour...), a party (which client/supplier), and a project (which site). Payments you recognise instantly; ones you don't, the bank remark reminds you. Five to ten minutes for a busy day.
Tagging a payment the day it happened takes seconds; reconstructing it from a statement 45 days later takes minutes and produces guesses. Multiply by 300 payments a month and the difference is a weekend — every month. Current books also mean current decisions: you see a project bleeding money in week two, not quarter three.
Aggressive battery managers (Samsung, Xiaomi, Vivo...) silently kill background apps, which stops capture. Whatever app you use, set its battery mode to unrestricted and add it to the "never sleeping" list — and verify capture with a ₹1 test payment after every phone or app update.