Sinking Fund

Personal Finance

A sinking fund is a dedicated savings account set aside to cover a predictable future large expense -- car replacement, home renovation, annual insurance premium, vacation, appliances. It converts a large sporadic expense into manageable monthly savings.

In detail

How sinking funds work:nIdentify future expense: car replacement in 5 years, estimate Rs 10LnDivide: Rs 10L / 60 months = Rs 16,667/month saved in a dedicated liquid fundnWhen expense arrives: fully funded, no loan needednnPersonal finance benefits:n1. No debt needed for predictable large expensesn2. No shock to monthly cash flown3. Earns interest while accumulatingn4. Psychological: dedicated purpose prevents spending the moneynnSinking fund vs emergency fund: emergency = unexpected. Sinking = expected but large. Both are needed.

Formula

Monthly sinking fund = Future expense / Months until expensenWith interest: Monthly contribution = FV / [((1+r)^n - 1)/r] / (1+r)

Real-life example

🇮🇳 India example

Riya wants to renovate her kitchen in 3 years at Rs 4L. Monthly sinking fund: Rs 4L / 36 = Rs 11,111. She opens a dedicated liquid fund SIP. After 3 years at 7.2% return: approximately Rs 4.29L -- more than needed. She pays contractor fully from savings, no personal loan required.

Frequently asked questions

How many sinking funds should I have? ▼

One for each predictable large expense: car replacement, home maintenance, annual premium payments, vacation, children's activity fees. Keep each in a separate liquid fund or FD to avoid mixing with emergency or investment money. Mentally labelling accounts helps maintain discipline.