Which sinking funds should I have?
Have one for every expense you know is coming that does not arrive monthly. For most households that means car maintenance and registration, insurance premiums paid annually or semi-annually, holidays and gifts, travel, home or renter's repairs, annual subscriptions and renewals, pet costs, and medical out-of-pocket. Start with the three that actually wrecked your budget last year rather than the whole list.
The list only matters if it is your list
The fastest way to build the right set is to read the last twelve months of your own statements and mark every charge that did not repeat monthly. That is your sinking fund list, in priority order, with amounts you do not have to guess at. A generic list is a prompt for jogging your memory; your statements are the evidence.
The ones almost everyone needs
Car maintenance, tires, and registration or inspection. Insurance premiums billed annually or twice a year. Holidays and gifts, including birthdays. Travel, including the trips you feel obliged to take. Home repairs if you own, and renter's costs like deposits and moving if you do not. These five cover the majority of the surprises that are not surprises.
The ones people forget until it is too late
Annual software and membership renewals that draw automatically. Pet care, including the vet visit that is not routine. Medical and dental out-of-pocket costs, which are a budgeting line like any other. Back-to-school or childcare gaps if you have kids. Professional licenses, certifications, and union or association dues. Taxes, if nothing is being withheld for you. And the big one: eventual car replacement, which is the largest predictable expense most people never fund.
How to size each one
Take the total you expect, divide by the number of months until it is due, and fund that every month. A premium due in ten months costs one tenth of itself monthly. Where you have no total — car repairs, medical — use what you actually spent last year as the estimate and adjust after a year of real data. An imperfect number that gets funded beats a precise one that does not.
Start with three, not fifteen
Fifteen sinking funds funded at implausibly small amounts is a spreadsheet, not a plan, and it is a reliable way to quit in month two. Pick the three irregular expenses that have actually disrupted you before, fund those properly, and add a fourth once the first three are running. Ranking by pain is a better ordering rule than ranking by amount.
The change to make today
Create three envelopes named for the three bills that hurt most in the last year, divide each total by the months until it is next due, and add those amounts to your next paycheck's assignments. In Envelope Budget these are ordinary envelopes you fund monthly and rarely spend from, and the savings-goal view will hold a target amount and date if the fund has a deadline you want to track.
Common questions
What is the difference between a sinking fund and an emergency fund?
A sinking fund is for a certainty you have not paid for yet — registration, a premium, the holidays. An emergency fund is for things you cannot predict. Paying predictable costs out of the emergency fund is how emergency funds end up empty when something genuinely unexpected happens.
Where should sinking fund money sit?
Anywhere you will not spend it accidentally and can reach when the bill arrives. Whether it is a separate savings account or simply an envelope in your budget matters much less than the money being earmarked and not double-counted as spendable.
What if I cannot afford to fund all of them?
Fund them in the order the bills arrive, not evenly. The registration due in two months gets funded before the holidays eight months out. Partial funding of the nearest obligation beats even funding of everything, because the nearest obligation is the one that will otherwise hit a credit card.
Run this budget on your phone
Envelope Budget is a cash envelope budgeting app for iPhone. Manual entry by design — the moment you log a purchase is the moment you notice it.
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