What is zero-based budgeting?

A zero-based budget plans the whole month before it starts, so that your income minus every planned spend, saving and repayment comes to exactly zero. Zero does not mean you spend everything. It means no rupee is left without a job, and some of those jobs are saving.

Here is one full month worked to zero, then the steps, then the costs.

What is zero-based budgeting?

Zero-based budgeting is planning each month so that income minus every planned spend, saving and repayment comes to exactly zero. Every rupee has a job before the month starts.

A budget, in plain terms, is a plan for your money written down before you spend it. The zero-based version asks for one extra thing: the plan must account for all of the money. If you earn ₹62,000, the lines in your plan add up to ₹62,000.

Saving is one of those lines. So is a loan instalment (an EMI, the fixed amount paid each month that covers interest and part of the loan) and so is the money you send home. A rupee set aside for an investment counts as assigned just as much as a rupee spent on rent.

You may also come across the phrase "zero-sum budgeting". That is a different idea. Zero-sum is a game-theory term, where one side's gain is another side's loss. It is not a budgeting method.

What does a zero-based budget look like?

Here is one month for one person, ending at zero. Take a 31-year-old in Jaipur, salaried, with take-home pay of ₹62,000 a month. Take-home pay is the amount that actually reaches the bank account, not the salary before deductions. This is an example, not a recommended split.

A few lines need a word. A sinking fund is a monthly set-aside for a known yearly or irregular cost, so that it does not land on one month. Here it covers three things:

• Two-wheeler insurance of ₹7,200 a year, which is ₹600 a month.
• Wedding and birthday gifts of ₹18,000 a year, which is ₹1,500 a month.
• A phone replacement of ₹12,000 a year, which is ₹1,000 a month.

Together that is ₹3,100 a month. The emergency fund is money kept aside for sudden costs, and the SIP is a fixed amount invested at regular intervals, usually monthly. In the table the SIP line is simply an amount set aside. It says nothing about what that money may become.

The last spending line, unplanned small spends, is a named line and not a leftover. Giving small unplanned spends a place in the plan keeps them from quietly eating into another line.

Plans change mid-month, and the method copes. Say a ₹2,500 repair turns up. Our person pays it by moving ₹1,500 from eating out and ₹1,000 from clothes. The total still reaches zero.

How do you make a zero-based budget?

Start from take-home pay, list fixed costs, add savings, repayments and sinking funds as lines, then give the rest to variable spending until the total equals income. In order:

1. Write down your take-home pay for the coming month, not your gross salary.
2. List the fixed costs: rent, EMIs, phone and internet, and anything else that is the same amount each month.
3. Add savings and repayments as lines of their own. They are part of the plan, not what is left over at the end.
4. Add sinking funds. Take each known yearly cost and divide it by 12.
5. Give the remaining money to variable spending, such as groceries, commute, eating out and clothes.
6. Add the lines and compare the total with your income. If it is higher, trim a variable line. If it is lower, give the gap a job. Stop when income minus total is zero.

Then run the month. When you spend, note it against its line.

Where do you keep the budget?

A notebook works. So does a spreadsheet with five columns: date, category, planned, actual and difference. Some people use an app with labelled "pots", the app version of the envelope method described below. Whichever you choose, the habit that matters is recording what you spend. Our guide to tracking your personal expenses covers that step.

Subscriptions are easy to miss in a plan like this. For a recurring card or UPI payment, you register an e-mandate, a standing permission for automatic debits. Under RBI's rules, your bank or card issuer must send a notice at least 24 hours before each charge, and you can withdraw the e-mandate at any point. Those notices help you spot each card or UPI subscription. UPI Autopay, the UPI version of an e-mandate, lets you view all your active mandates in any UPI app and revoke, pause or modify them.

Can you use zero-based budgeting with an irregular income?

Yes. Irregular income is income that changes from month to month. You plan on your lowest recent month, and when more arrives, you give the extra a job the day it comes.

Take a freelancer whose last six months ranged from ₹38,000 to ₹70,000. She plans the whole month on ₹38,000. Her plan still reaches zero on that figure.

When a good month brings more than ₹38,000, the extra is not spent by default. It goes first to a buffer, money held back for thinner months, and then to savings. Because the plan was built on the low figure, a good month adds to it.

For the full method of smoothing uneven pay, see our guide on how to plan your finances when you have irregular income.

Is zero-based budgeting worth the effort?

It suits people who want to know where every rupee goes and are willing to sit down and plan each month. It suits less those who want a quick rule and do not want to plan.

The costs are real.

• Time. You plan every month and keep track as the month runs. This takes more effort than a rule that needs no planning.
• One missed category breaks it. If a cost you forgot appears, the total no longer reaches zero, and something else has to give.
• Rigidity. If you over-plan every line, a normal month can feel like a string of small failures. A named line for unplanned spends, and moving money between lines as in the repair example, leave some room.

Two other approaches are worth setting beside it. The 50-30-20 rule is a common rule of thumb, not a regulation: about half of take-home pay for needs, 30% for wants and 20% for saving and investing. It is a rough split, not a line-by-line plan. The envelope method splits spending money into labelled envelopes, or app pots, and you spend each category only from its own.

In the example, the emergency fund line sits beside the SIP line. Money set aside for emergencies before starting a SIP means a sudden cost does not force a sale when prices are low or stop the SIP. Our guide on where to keep your emergency savings puts its size at three to six months of expenses. If the SIP line interests you, read about the systematic investment plan (SIP), and for the wider picture see the ultimate guide to money management.