Quick Summary
The effective interest rate states what a loan actually costs per year, expressed as a percentage. It covers the nominal rate and every cost the lender makes a condition of the loan, which makes it the one figure that lets you compare two offers properly.
Definition in Detail
The effective interest rate, officially the effective annual rate, expresses the total cost of a loan as a percentage of the net loan amount per year. In Germany it is governed by Section 16 of the Price Indication Regulation (PAngV), and the calculation method itself sits in the annex to that section. Because every German lender applies the same rule, the disclosed figures can be compared against each other.
The nominal rate answers one question only: how expensive is the borrowed capital? The effective rate answers the question that actually concerns you, which is what you end up paying. Under Section 16 paragraph 3 PAngV, the calculation takes in:
- the nominal rate and all further costs known to the lender,
- the payment rhythm, meaning when you repay and when interest accrues,
- brokerage costs,
- account management costs where opening the account is a precondition for the loan,
- the cost of a required property valuation.
Section 16 paragraph 4 PAngV expressly leaves out costs arising from default, together with insurance and additional services that are not a precondition for the loan. A great deal turns on that condition, as the payment protection insurance example further down shows.
Why the Two Rates Diverge
Plenty of guides claim the effective rate is always higher than the nominal rate. That holds almost always, though not for the reason most people assume. The gap does not begin with fees. It begins with the payment rhythm: you repay a German instalment loan monthly, while the quoted nominal rate is an annual figure. That conversion alone lifts the effective rate.
The table below shows this for a 10,000 euro loan over 48 months on which noancillary costs arise at all:
| Nominal rate p.a. | Monthly payment | Effective rate | Gap |
|---|---|---|---|
| 4.50% | 228.03 € | 4.59% | 0.09 pp |
| 5.50% | 232.56 € | 5.64% | 0.14 pp |
| 6.20% | 235.77 € | 6.38% | 0.18 pp |
| 7.50% | 241.79 € | 7.76% | 0.26 pp |
Own calculation following the method in the annex to Section 16 PAngV, monthly annuity, commercially rounded. The higher the nominal rate, the wider the gap.
Parity is possible but rare. Repay the same loan in four annual instalments instead of 48 monthly ones, with no costs attached, and the effective rate lands at exactly 5.50 percent, level with the nominal rate. German instalment loans are almost never structured that way.
Worked Example: Lower Rate, Costlier Loan
The practical value of the effective rate shows up when two offers are built differently. Offer A advertises the lower nominal rate but charges a brokerage fee deducted from the amount paid out. Offer B carries the higher nominal rate and no other costs.
| Cost factor | Offer A | Offer B |
|---|---|---|
| Loan amount | 10,000 € | 10,000 € |
| Term | 48 months | 48 months |
| Nominal rate (fixed) | 5.50% | 6.20% |
| Brokerage cost | 300 € | 0 € |
| Monthly payment | 232.56 € | 235.77 € |
| Total cost of credit | 1,463.11 € | 1,316.88 € |
| Effective rate | 7.30% | 6.38% |
Result: Offer A has the lower nominal rate and the lower monthly payment, yet costs 146.23 euros more. The brokerage fee cuts the payout to 9,700 euros while you keep repaying against 10,000. The effective rate makes that difference visible; the monthly payment hides it.
Worked example using assumed figures for illustration. It is neither an offer nor a statement about any particular provider. Own calculation following the method in the annex to Section 16 PAngV.
What the Effective Rate Does and Where It Stops
What it is built for
- Making offers from different lenders directly comparable
- A uniform calculation under Section 16 PAngV for every lender
- Mandatory disclosure in pre-contractual documents and the agreement
- Surfacing every cost that is a condition of the loan
What you still have to watch
- Optional add-ons stay outside the figure, while payment protection insurance required as a condition does not
- With a variable nominal rate the disclosed value is a snapshot
- Costs that only arise on default are not included
- An identical effective rate across different terms does not mean identical total cost
That last point gets overlooked often. Two offers with the same effective rate can differ substantially in total, if one runs 36 months and the other 84. Always read both figures together: the effective rate, and the amount you repay overall.
Frequently Asked Questions
What is the difference between the effective and the nominal interest rate?
The nominal rate (Sollzins) is the plain interest charged on the money you borrow. The effective rate also accounts for when you pay and which costs the lender makes a condition of the loan. With a German instalment loan repaid monthly, the effective rate sits above the nominal rate even when no fee at all is charged, because the nominal figure is an annual value while your payments are spread across the year.
Can the effective rate ever equal the nominal rate?
Yes, but only in one specific case: no additional costs arise and repayment happens exactly once a year. At a 5.50 percent nominal rate on 10,000 euros repaid in four annual instalments, the effective rate is exactly 5.50 percent. As soon as you pay monthly or any fee applies, it rises. So the common claim that the effective rate is always higher is nearly, though not entirely, correct.
How is the effective interest rate calculated?
The method is set out in the annex to Section 16 of the German Price Indication Regulation (PAngV). It arranges every payment you make and receive so that both sides, once discounted, come to the same present value. You cannot reliably do this in your head, and you do not need to: the lender must disclose the effective annual rate, and every lender computes it under the same rules.
Which costs are included in the effective rate?
Section 16 paragraph 3 PAngV covers interest plus all other costs known to the lender, including brokerage costs and account management costs where opening the account is a precondition for the loan. Costs for a required property valuation also count. The deciding factor is the condition: costs you must bear in order to obtain the loan belong in the effective rate.
Is payment protection insurance included in the effective rate?
That depends on whether the policy is optional. Section 16 paragraph 4 PAngV excludes insurance from the calculation only where it is not a precondition for the loan or for the terms on offer. If the lender requires the policy, its cost belongs in the effective rate. Check the offer document for wording that makes the insurance a condition.
Must the effective rate appear in advertising?
For consumer credit, Section 17 PAngV governs advertising that mentions interest rates or costs. Once an advertisement states figures for interest or charges, it must also state the effective annual rate along with further mandatory information. In pre-contractual documents and in the credit agreement itself, the effective annual rate has to be disclosed in any case.
Legal Notice
The duty to disclose the effective annual rate for consumer credit follows from Section 16 of the German Price Indication Regulation, and the calculation method from the annex to that section; Section 17 PAngV governs advertising. This article explains the calculation logic and does not replace legal or financial advice in an individual case. Last reviewed: August 2026.