Running costs (Unterhaltskosten)
Running costs are the expenses that keep recurring after you acquire something — separate from the one-time price you paid for it. A car, a flat, a subscription, or a pet all have a purchase price or entry cost, and then a stream of ongoing charges: maintenance, insurance, fees, energy, repairs. Running costs are the variable and fixed costs that continue for as long as you own or hold the thing.
Why it matters
A purchase price is a single number; running costs are a commitment that repeats for years. Comparing two options by price alone — two cars, two flats, two contracts — hides which one actually costs more over time, because the cheaper one to buy is often the more expensive one to keep. Running costs combine fixed costs (Fixkosten, the ones that don't change with use, like insurance premiums) and variable costs (Variable Kosten, the ones that scale with use, like fuel or utilities) into a single ongoing burden.
For most durable purchases, the running costs — not the sticker price — are what the decision should turn on: over a few years they routinely exceed the purchase price itself, so the true cost of owning something is the price plus everything it takes to keep. This is where a common budgeting mistake lives. Saving up exactly the sticker price, and no more, clears the purchase but not the ownership: the money is enough to buy the thing and not enough to run it, and an item that looked affordable at the till quietly changes the household's math the moment the monthly costs start landing.
Understanding running costs is a prerequisite for evaluating any purchase that isn't consumed immediately. It underlies decisions about whether to buy or rent, which model or plan to choose, and how a household budget behaves month to month rather than just on the day of purchase.
Worked examples
1. A car — running costs beyond the sticker price. A used car costs an illustrative €12,000 to buy. Owning it then adds recurring costs: Kfz-Versicherung (car insurance) at an illustrative €600/year, Kfz-Steuer (vehicle tax) at €120/year, fuel at €150/month, and maintenance averaging €80/month. Annual running costs: €600 + €120 + (€150 x 12) + (€80 x 12) = €3,480/year. Over five years, running costs alone total €17,400 — more than the purchase price.
2. A rented flat — running costs on top of rent. A flat has a Kaltmiete (cold rent, excluding utilities) of an illustrative €900/month. Running costs add Nebenkosten (ancillary costs: heating, water, building maintenance) of €200/month and electricity of €70/month. Total monthly running cost of living in the flat: €900 + €200 + €70 = €1,170, not the €900 the rent listing advertises.
| Item | One-time cost | Monthly running cost |
|---|---|---|
| Car (illustrative) | €12,000 purchase | €290 (insurance, tax, fuel, maintenance) |
| Flat (illustrative) | Deposit, moving costs | €1,170 (rent + Nebenkosten + electricity) |
Comparing only the left column — the one-time cost — gives an incomplete picture; the monthly running cost determines what the item actually takes out of a budget over time.
Check yourself
A car has an insurance premium of an illustrative €50/month, road tax of €10/month, and average fuel plus maintenance of €230/month. What are the total monthly running costs?
Two flats are advertised at the same Kaltmiete (cold rent, excluding utilities) of €900/month. Flat A has Nebenkosten (ancillary costs: heating, water, building upkeep) of €150/month; Flat B has €280/month. Which statement is correct?
Which of the following are examples of running costs, as opposed to a one-time purchase cost? (Select all that apply.)