Sinking fund (Rücklagen)

Level 1 · Basics⚙ Method

German termRücklagen

Read firstFixed vs. variable costs

Used bySmoothing irregular income

Deep divesBudgeting Methods

A sinking fund is money set aside each month for a large, predictable expense — an annual insurance premium, a car repair, a holiday flight — so the bill never collides with everyday spending. Divide the total cost by the months until it's due, and save that fixed amount every month in a separate account until the expense arrives.

Why it matters

German households routinely face large bills that don't arrive monthly: an annual Kfz-Versicherung (car insurance) premium, a Rundfunkbeitrag (public broadcasting fee) billed quarterly, or a car repair that's overdue rather than sudden. What makes a sinking fund possible is recognizing which costs are fixed but irregular, rather than variable and genuinely unpredictable — that distinction is the whole point of separating fixed from variable costs. A sinking fund — Rücklagen (reserves) in German banking language — turns an irregular fixed cost into a level monthly transfer, so the account balance doesn't spike or crash the month the bill lands.

The same mechanism generalizes further: once irregular expenses are smoothed into predictable monthly amounts, an irregular income — freelance invoices, seasonal work, variable commissions — has fewer surprise collisions to manage against a fixed spending floor.

The method

1. List every recurring-but-not-monthly expense. Car insurance, the vehicle inspection (TÜV/Hauptuntersuchung), the broadcasting fee, annual software licenses, holiday travel, gifts.
2. Estimate the total amount and the due date for each one, using last year's bill or the current contract.
3. Divide the total by the number of months until it's due (or between renewals, for recurring items) to get a monthly contribution.
4. Automate the transfer — a standing order (Dauerauftrag) moving that amount into a separate account or subaccount on payday, before the money can be spent elsewhere.
5. Pay the bill from the fund, not from that month's regular income, when it arrives.
6. Recalculate whenever a premium changes or a new irregular expense appears.

Worked example

The figures below are illustrative; a real plan uses each household's own bills and current premiums.

Expense	Annual cost	Due	Monthly contribution
Kfz-Versicherung (car insurance)	€720	November	€60
Rundfunkbeitrag (broadcasting fee)	€216	Quarterly	€18
Repairs & TÜV (vehicle inspection)	€300	Variable	€25
Total	€1,236	—	€103

A household sets up a €103/month standing order into a subaccount labeled "Rücklagen." Because the €103 is really three separate sub-totals tracked against three separate due dates — not one lump sum — each category funds its own bill independently: the €60/month car-insurance portion accumulates to €720 over the twelve months before the November premium, the €18/month broadcasting portion covers each €54 quarterly bill as it lands, and the €25/month repair portion builds a cushion for whenever a repair or the TÜV falls due. No single bill collides with that month's paycheck, because the money was set aside gradually in advance.

Check yourself

A Wohngebäudeversicherung (building insurance) premium of €540 is due in 9 months. To cover it with a sinking fund, how many euros should be transferred into the fund each month?

How does a sinking fund differ from an emergency fund (Notgroschen)?

A sinking fund covers unplanned shocks like job loss; an emergency fund covers known future bills.A sinking fund covers expenses you already know are coming (e.g., annual insurance); an emergency fund covers unplanned shocks (e.g., job loss).There is no real difference — both terms describe the same type of account.A sinking fund only applies to business accounting, not personal budgets.

Which of these expenses are well suited to funding through a sinking fund? Select all that apply.

An annual car insurance premiumThe quarterly Rundfunkbeitrag (broadcasting fee)This month's grocery billAn unexpected medical bill after an accident

A household's car insurance premium rises from €720 to €840 at the next renewal, still due in 12 months. What keeps the sinking fund on track?

Recalculate the monthly contribution to €70 (€840 / 12).Keep contributing €60/month as before, since that worked last year.Stop the sinking fund, since the premium is no longer predictable.Withdraw the existing fund balance immediately and start over.