Cash Flow and the Emergency Fund

Most people know the first number roughly, guess the second, and never compute the third. Bank statements make it easy to be wrong in the same direction every month: the salary credit is one line, while the spending is sixty small lines. Add them up once and the gap often differs from the guess by a few thousand rupees a month.

Irregular income needs a rule before it enters the sheet. A common one is to plan on the stable part and treat the rest as surplus when it arrives. Here is one year of side income for the example household, in rupees by month:

The average is ₹8,000, but three months paid nothing. A budget built on ₹8,000 a month fails in those three months. The sheet below shows ₹8,000 in income for the savings rate, and the emergency fund section later counts only the salary. Two uses, two numbers, one source.

The fix for annual spends is arithmetic. Take the yearly amount, divide by twelve, and treat it as a monthly spend that happens to be saved up first. ₹72,000 a year for festivals and travel is ₹6,000 a month. If it is not in the sheet monthly, it shows up as a shortfall in the one month it falls due, and the shortfall goes on a credit card (module 20.3 prices that).

The other split that matters is essential against the rest. Essential means it continues if income stops: rent, EMIs, premiums, school fees, utilities, groceries, commuting, ordinary medical costs. Everything else can be paused. The emergency fund is sized on the essential list alone, so the sheet carries that split from the start.

Three readings come off this sheet. The savings rate is 20.4%. Essential spends take 63.4% of everything that comes in, so the household can cut at most the remaining 16.2% (₹17,500) before touching a fixed cost. And if the side income stopped, the gap would shrink from ₹22,000 to ₹14,000, still positive. That last test is worth running on any sheet: remove the irregular income and see whether the gap survives.

The sheet also shows where a rupee of change moves the gap most. A 10% cut in the variable lines (₹26,000 in total) frees ₹2,600 a month, or ₹31,200 a year. A 10% cut in rent frees the same ₹2,600 a month but needs a house move. Which lever suits a household is its own call. The sheet only prices them.

No regulator sets the number of months. It is a rule of thumb, and the usual range is 3 to 6 months of essential spends for a steady salary, more when income is variable or when others depend on it. What moves the number is how long income could stop. Four things push it up or down:

For the sheet above, essential spends are ₹68,500 a month. The same sheet gives four sizes:

Take the 6 month row. The household already holds ₹1,20,000 in a savings account. The gap is ₹4,11,000 less ₹1,20,000, which is ₹2,91,000. At ₹15,000 a month that takes 19.4 months. At ₹22,000 a month, the full surplus, it takes 13.2 months. Nothing about the product changes the date. The savings rate does.

The emergency fund calculator on Learn tools does the same sum with a few more switches.

Savings account. RBI's directions on interest rates on deposits (commercial banks, updated as on 1 Oct 2026) say interest on a savings deposit is calculated on a daily product basis, with one uniform rate on balances up to ₹1 lakh and room for different rates above it, and that it is credited at quarterly or shorter intervals. Banks set the rate. The money is reachable the same day through the usual channels.

Sweep deposit. The bank moves balance above a set level into a term deposit and moves it back when the savings account runs low. The term deposit part earns the term deposit rate. Under the same RBI directions, a bank must have a board approved policy on penalties for premature withdrawal and must tell the depositor the components of the penalty when the deposit is accepted; if it does not, no penalty can be levied. The minimum tenor a bank can offer is seven days.

Liquid fund. SEBI defines the category in its circular of 26 Feb 2026 on categorisation of mutual fund schemes (clause 2.6 of the Master Circular for Mutual Funds, as superseded): an open ended scheme that invests only in debt and money market securities with maturity of up to 91 days. The price, the NAV, moves every day. It is not a deposit and nothing in it is insured by DICGC. Redemption is not instant like a savings account, and the scheme documents state the timing.

Overnight fund. Same circular: an open ended debt scheme investing in overnight securities, that is securities with a maturity of 1 day. It may place up to 5% of net assets in government securities or treasury bills of up to 30 days residual maturity as margin and collateral. Holding only 1 day securities leaves little room for the price changes that a portfolio of up to 91 day instruments can have.

A fund in one of the last two categories rests on a rule, not a promise. The rule says what it can hold. It does not say the NAV never dips. For money that must be there on a particular day, that distinction is the whole decision.

The guide adds that funds held in different types of ownership at the same bank, such as an individual account and a joint account, are insured separately, and so are funds in different banks. For an emergency fund, that gives a plain arithmetic choice. ₹7 lakh at one bank, in one name, leaves ₹2 lakh (28.6%) above the limit. ₹3.5 lakh at each of two banks leaves nothing above it. The cost of the second arrangement is a second set of accounts to keep active and to check.

Two more numbers help with proportion. At 31 March 2026 (provisional, DICGC), 293.5 crore accounts were fully protected, that is accounts with a balance up to ₹5 lakh, and they were 97.4% of all accounts. Yet insured deposits of ₹1,09,33,948 crore were only 39.7% of assessable deposits of ₹2,75,43,642 crore. The two figures count different things: accounts against rupees. Almost every account is below the limit, and most of the rupees are above it.

Insured is not the same as accessible this week. DICGC pays the liquidator within two months of receiving the claim list from the liquidator. For a bank placed under All-Inclusive Directions, section 18A of the DICGC Act, in force from 1 Sep 2021, makes DICGC liable to settle within 90 days, provided the bank submits the depositor list within 45 days of the Directions. The premium is paid by the banks, not the depositor. From 1 April 2026 DICGC moves that premium from a flat rate to a risk based framework (press release of 6 Feb 2026 and annual report press release of 14 Oct 2026).

Under section 156(2), a resident individual in this regime whose total income is up to ₹12 lakh gets a rebate of the whole tax or ₹60,000, whichever is less. Above ₹12 lakh the rebate tapers so that the tax payable is capped at the amount by which income exceeds ₹12 lakh. This matters for interest. An income of ₹11,95,000 pays nothing. Add ₹10,000 of interest and the total is ₹12,05,000: the slab tax is ₹60,750, the rebate leaves ₹5,000 (before cess), so the ₹5,000 above the line has cost ₹5,000, a marginal rate of 100% in that band. The relief runs out at about ₹12.71 lakh, where the slab tax equals the excess over ₹12 lakh.

Savings account interest. It is income from other sources, taxed at the slab. A deduction exists, section 153 of the new Act (the old 80TTA and 80TTB): up to ₹10,000 of savings account interest for an individual who is not a senior citizen, and up to ₹50,000 of interest on any deposit, including term deposits, for a senior citizen. The default regime does not allow it. Section 202(2)(a)(xii) bars the Chapter VIII deductions in the default regime, except a few listed sections, and section 153 is not among them.

Term and sweep deposit interest. Slab rate as well. The bank deducts tax at source when interest paid in the year by that bank goes above ₹50,000 (₹1,00,000 for a senior citizen), at 10% (section 393(1), Table Sl. 5(ii), Income-tax Act, 2025; rate from the First Schedule, Part II, of the Finance Bill, 2026 as introduced). The tax deducted is a prepayment against your tax, not the tax itself. Interest below the threshold is still taxable. If total income is under the rebate limit, the deducted amount comes back as a refund when the return is filed.

Liquid and overnight funds. Section 76 of the Act treats the gain on units of a "specified mutual fund" acquired on or after 1 April 2023 as a short term capital gain, whatever the holding period. A specified mutual fund is one that invests more than 65% of its proceeds in debt and money market instruments, a test measured on the annual average of daily closing figures. The gain is taxed at the slab. A liquid fund and an overnight fund both meet the test, so both are taxed like the interest on a deposit, with one difference: the tax falls when units are redeemed, not as interest is credited.

Because every option is taxed at the slab, the after tax yield is the pre tax yield times one minus the slab rate with cess. Here is that table on an assumed pre tax yield of 6.5%, for a deposit or a fund (the 6.5% is an input for arithmetic, not a quote):

Read the slab off total income, not off the salary alone. Interest stacks on top of everything else, so the first rupee of interest is taxed at the rate that the last rupee of salary reached. For a household under the rebate limit, the tax column is zero. For one in the 30% slab, a 6.5% deposit pays 4.47%, which is the yield to compare with the loan rates in module 20.3.

Pre tax interest for a year: ₹3,000 plus ₹9,750 plus ₹9,660 is ₹22,410, a blended 5.45%. After tax at the 20.8% slab, the interest is ₹17,749, a blended 4.32%. At the 10.4% slab, ₹20,079, or 4.89%. At the 31.2% slab, ₹15,418, or 3.75%. The first two layers sit in the same bank in one name, ₹2.5 lakh in total, which is inside the ₹5 lakh limit. The liquid fund layer has no insurance and a small NAV risk, which is the price of its extra reach.

What the layering gives is not yield. Shifting ₹1 lakh from the 3% layer to the 6% layer adds ₹3,000 a year before tax, about ₹250 a month. What it gives is a plan for the first week, the first month and the fourth month. That is a design choice. The next paragraph is the trade: more in the savings account is faster and earns less, more in the liquid fund earns more and takes a working day.