Nestbalm

Why do I (we) need a budgeting app?

It’s the 24th. The rent left three weeks ago, and the number in your banking app is one you glance at and close again.

So you do the sum. School trip first, and the instalment gets squeezed; instalment first, and the food shop shrinks. At 11pm you push one bill to next week and hope.

If you manage money with someone at home, this one is for both of you.

The short answer. In our view, the hard part isn’t spending. It’s deciding what to pay first, again and again. A plan made once, on income day, and checked against what really happened, can take much of that deciding away. You can do it on paper. An app earns its place when you want to look back over past months easily and, on the Family plan, share the plan with the person you manage money with.

Credit first: the quiet bridge

This section is general information. It names no product or provider, and the rates are averages, not offers. If you compare offers, compare them by their effective annual rate.

Credit is the obvious bridge across that last stretch. The catch is quiet. Credit can take part of your next income before it arrives. What you borrow on the 24th may be missing on the 1st, and it has to be paid back, often with interest. For a while the gap isn’t closed, just moved.

The overdraft (Dispo) is part of many current accounts. Stiftung Warentest, Germany’s consumer-testing foundation, found that banks charge 10.99% a year on average for it (as of 18 May 2026), and the most expensive charges 15.39%. In Bundesbank data (Germany’s central bank; the August 2026 figures were provisional when published), households paid about 9.5% a year on overdrafts and revolving credit lines taken together in August 2026. Stiftung Warentest advises using an expensive Dispo only in an emergency.

An instalment loan means fixed payments over an agreed term. Stiftung Warentest says that an instalment loan used to pay off Dispo debt often costs less than the Dispo, though that depends on the offer. In Bundesbank data, consumer loans newly agreed in August 2026 averaged about 8.7% effective a year. These are averages across banks and they measure different things, so read them as orders of magnitude, not as what you would be offered.

Card credit starts when a card bill isn’t paid in full. Balances left after the due date averaged about 17.5% effective a year in August 2026 (Bundesbank, same release); a card paid off every month carries no interest.

Checkout credit (“pay later”) is the easiest to say yes to. Verbraucherzentrale Hamburg (a consumer advice organisation) points out that some zero-percent offers are really credit card contracts, costing 9.90% to 18.90% a year once the interest-free period ends. SCHUFA, Germany’s credit bureau, counted 7.5 million new small instalment loans (from €100 to under €1,000) in 2025, up from 6.7 million in 2024, and links the rise to pay-later offers, without a separate count.

From 20 November 2026, new consumer credit rules apply in Germany. According to Stiftung Warentest, pay-later instalment offers and loans under €200 then fall under the regular credit rules, including a creditworthiness check. Contracts already running keep the old rules, and short interest-free payment deadlines are treated differently (see the Stiftung Warentest article in the sources).

None of this makes credit the villain. If you’d like a limit on it, here’s one example, and only an example: on a calm day, write down the most that all your credit payments together may take from one income, as a euro amount. Before you take on anything new, check whether it fits under that number. If it doesn’t, the rule says it waits. You choose the number; it’s your household’s. If payments you already have are getting hard to meet, talk to your bank (more on that below).

The real hurdle: deciding what to pay first

Underneath sits a quieter question: which bill goes first, which can wait, which can’t.

How common is the squeeze? It depends on what you measure. In 2025, 31.9% of people in Germany could not pay an unexpected expense of at least €1,300 from their own resources (Destatis): a missing cushion for a one-off cost, not a month-end shortfall. In 2024, 7.3% in Germany said they made ends meet with difficulty or great difficulty, the joint lowest share in the EU (Eurostat): self-reported, and a different question.

What do studies say about the days before the next income? In US data on Social Security recipients, spending on things like meals out rose on the day the cheque arrived (the authors call the effect small), and retirees without savings ate less in the week before it, while those with savings smoothed their spending. UK households’ spending also responded to the arrival of a paycheque more than you would expect when the date is known in advance. Researchers explain such patterns differently: impatience in some studies, tight cash in others, and in one working paper the timing of rent and other bills. We found no comparable German study.

In lab experiments from 2010, people tended to choose the less mentally demanding option when free to choose. Ranking bills week after week is such a choice; that link is our reasoning, not a finding.

You may have read that money worries make it harder to think clearly. The evidence is contested: a 2025 meta-analysis of 14 studies (from 11 papers) found it inconclusive, and if there is an effect it is small. A US study that randomly assigned low-income households to an online survey before or after payday found no difference in the quality of decisions, though before payday people made more present-biased choices about money. So we won’t claim it.

We found no study that measured calm or freedom, so this part is our reasoning, not a finding. A repayment you have already planned, for the month and for an amount you chose, is a decision already made. In our view, that can leave less to think about and less to worry about, and may ease the constant feeling that you have to do something about the loan: it is one line in the plan. It doesn’t make the debt smaller, and some worries need a conversation, not a plan (more on that below). The freedom we mean is small and specific: not having to rank your bills at 11pm, and perhaps less of the loan on your mind.

Decide once, on income day

One approach: decide once, on the day the income arrives. The order could look like this:

  1. Essentials and fixed costs: housing, energy, food, monthly insurance.
  2. Loan instalments, plus, where there’s room, an extra amount you choose toward a loan.
  3. Planned one-offs, set aside now: yearly insurance premiums, the school trip.
  4. The rest, planned across the days until the next income.

When there’s room, putting a larger share of the new income toward repaying a loan, and planning the rest, can be a step in the right direction. Not every month has room, and that’s fine.

When money is short, the Verbraucherzentrale ranks rent, energy and food above loan instalments and says to talk to your bank.

Section 500 of the German Civil Code (BGB) lets you repay a consumer loan early, in whole or in part, at any time; interest then stops at the repayment date (section 501). A fee is possible only where a fixed interest rate was agreed, and section 502 caps it at 1% of the amount repaid early (0.5% if a year or less remains, and never more than the interest you would have paid). Check your contract for fees, and check the current text of the law: the new credit law amends some of these provisions.

The 20-minute version: pen, paper, no app (plus five minutes a week to look back)

  1. Income (2 minutes). Note what’s coming in, and when.
  2. Essentials and fixed costs (6). Housing, energy, food, monthly insurance and other fixed costs, with due dates.
  3. Loans (3). Each instalment, plus, if you like, an extra amount for one loan.
  4. One-offs (4). What’s due before the next income, including yearly insurance premiums.
  5. The rest (5). Subtract everything, divide what’s left by the days until the next income, and write it at the top. Below zero? Better to know on day one than on the 28th. That’s the moment to talk to your bank (more on that below).
  6. Look back (weekly, 5). Put the plan next to your bank statement and note where they differ.

So why an app at all?

So do you need an app? Not for the routine: it works on paper. The case for a tool is the looking back, and, on the Family plan, a shared place where you and your partner can both see the plan.

Having a plan isn’t the same as following it: among 516 US users of one online debt-management service, many repaid less than they had planned (Kuchler and Pagel, 2021; not a representative sample). Seeing planned and actual side by side can show, as soon as you have uploaded the latest statement, which line is too tight and which too generous. In our view, that’s how discipline gets built: by doing it, not by deciding to have it.

Research on apps that give an overview of your money is young. In one study of Icelandic users of a money-overview app, fees charged when an account lacks the money for a payment fell after the mobile version launched; other fees changed less clearly. The authors’ leading explanation is that easier access to information helped people avoid mistakes. It was one app in one country, among people already using it, not randomised, and it measured fees, not stress. In an Italian savings app (figures from the authors’ 2022 working paper), goal setting was switched on for 122 users 50 days before everyone else got it, and those users saved more than the others, although only about 28% of them actually set a goal. The authors describe the assignment as random, but the company didn’t record how it was done. The study was about saving, not planning expenses. Neither study tested Nestbalm.

We found no study that tests whether seeing planned versus actual spending, or deciding the order once, helps people keep to a plan. “Decide once” is our reasoning.

What this looks like in Nestbalm

We created an app that helps people plan expenses, track them with visual tools, and avoid unpleasant surprises from unexpected (forgotten) spending.

Nestbalm plans by calendar month; there is no pay-cycle setting. If your salary arrives at the end of the month, you can move that payment into the next month’s budget in Nestbalm (nothing moves in your bank account), so it funds that month’s plan. You set up fixed costs and recurring bills as categories with a planned amount and a due day or payment months, and Nestbalm shows what is due this month and what is still to be paid. You set planned amounts per category. For bigger or irregular costs, such as an annual insurance premium, you set the amount and the month it is due, and Nestbalm spreads it across the months before. For a one-off, such as a school trip, you raise the planned amount for that month. Then you see planned versus actual (executed) spending side by side, and what’s left of the plan for the month.

Loan repayments fit into the same plan: give them their own category and plan them like any other cost. You can create categories of your own and name them as you like, for example Loan or Credit, and collect your repayments there for an overview; once you have sorted a payment, Nestbalm learns to sort that payee the same way. Nestbalm has no loan feature of its own: a repayment is a category like any other, with a planned and an actual amount. Each month’s budget has its own planned amount for a category, and the plan can differ from month to month, for instance a different repayment in a month with more or less room. The actual amounts come from the bank transactions in the statement files you upload, so they are only as current as your last upload. For each month you upload statements for, you can see what you planned to repay and what actually went out.

On the Family plan, you can invite your partner to the same account, so the two of you review the budget together; the account owner sets the planned amounts.

Nestbalm works from bank statement files you upload; there’s no live bank connection (why, in our post on bank connections). And Nestbalm doesn’t hold or move money.

When an app is not enough

Some situations need a person, not a plan: payments that keep outrunning income, or borrowing to cover other borrowing.

Your bank. The Verbraucherzentrale’s advice for a shortfall is to talk to your bank.

Debt counselling. Non-profit services run by welfare organisations such as Caritas and Diakonie, by the Verbraucherzentralen and by municipalities are often free or low-cost, but funding differs from place to place and there is no nationwide right to free advice. A law approved on 25 September 2026, which may not be in force yet, provides that centres may charge reasonable fees, as long as they tell you the cost beforehand. Ask about cost before the first appointment. Some services have waiting lists, so it helps to get in touch sooner.

To find one, meine-schulden.de, from the national association of debt counsellors, has a directory of counselling centres.

This article is general information, not individual financial or legal advice.

Curious how it looks in Nestbalm? Have a look at nestbalm.com.

Sources (as read in October 2026)

By the Nestbalm team.

We created an app that helps people plan expenses, track them with visual tools, and avoid unpleasant surprises from unexpected (forgotten) spending. Families can use it to educate their kids on what money is and how to use it.

See Nestbalm →