Savings Deposit
Also known as: Savings account, Instant-access account, Tagesgeld
The product almost everyone owns and almost nobody analyses: a loan you make to a bank, repayable on demand, at a rate the bank chooses.
1 · SnapshotThe one idea to remember
2 · BeginnerWhat is it, really?
A savings deposit is a loan you make to a bank. The bank owes you the money back, usually on demand, and pays interest for the use of it in the meantime. That is the entire product.
Two things follow from "it is a loan", and both surprise people:
- The money is not in a vault with your name on it. The bank lends it on. What you hold is a claim on the bank, not a box of cash.
- The rate is set by the bank, not by contract. It can be changed at any time, and historically it rises slowly when policy rates rise and falls quickly when they fall.
What makes the deal work anyway is deposit insurance: in most developed jurisdictions a state-backed scheme guarantees balances up to a per-bank, per-person limit. Below that limit the bank's credit quality is genuinely somebody else's problem. Above it, it is yours.
a paymentonly if a condition is metnot a payment
Nothing is held for you. The protection is a separate scheme with its own limit, and it is not the bank.
When you deposit
- You → The bank It becomes the bank's own money and is lent out. What you hold is a claim, and your name is not on any particular asset.
While it sits there
- The bank → You Changeable at the bank's discretion on most instant-access accounts, which is why the rate on an old account drifts away from the market.
- The bank → You The promise that makes it a deposit — and the promise that cannot be kept by every depositor at once, because the assets are long and the liability is instant.
If the bank fails
- Guarantee scheme → You A statutory scheme pays out, per depositor per institution, up to a limit set in law. Above that limit you are an ordinary creditor of the failed bank.
- Asset class
- Money markets (retail bank funding)
- Instrument type
- Demand deposit
- Traded
- Not traded — a contract with one bank
- Typical users
- Every household; corporate treasuries at scale
Which risks decide the outcome
Not how risky this is, and not a rating — there is deliberately no total. It says which of five failure modes drives what happens here, in the same order on all 129 products so they can be compared. This publication's own reading; see the notice below.
- Marketbarely applies
- Creditdecides it
- Liquiditymatters
- Fundingbarely applies
- Operationalmatters
What decides it here. It is an unsecured loan to a bank. The guarantee scheme covers a stated amount per depositor per institution; above that line you are an ordinary creditor.
3 · IntermediateHow it works in practice
The rate you are actually paid
- Deposit beta is the industry term for how much of a policy-rate move is passed on. Betas of 0.2–0.5 on instant-access savings are ordinary — a 4% policy rate can sit alongside a 1% savings rate for years.
- Back-book pricing: new customers get the advertised rate; existing balances quietly stay on an older, lower one. The gap is a large and deliberate source of bank margin.
- Compounding frequency matters less than the headline, but it matters: use the nominal-to-effective converter to compare accounts quoting monthly and annual interest.
The real return is the only one that counts
Nominal safety is not real safety. A 2% deposit rate against 4% inflation loses 2% of purchasing power a year with complete certainty — the one loss no risk model flags because the nominal balance never falls. The real-return calculator makes the size of it visible.
Deposit insurance in practice
| Feature | How it typically works |
|---|---|
| Limit | Per depositor, per institution, per scheme — not per account |
| Joint accounts | Usually counted per holder, doubling the effective cover |
| Brands | Several brands can share one banking licence and one limit |
| Payout | Days to weeks in modern schemes; the money is frozen meanwhile |
4 · AdvancedPricing & valuation
Why the deposit is the bank's most valuable liability
Deposits are contractually repayable on demand but behave as long-term funding — households do not move them for a few basis points. Banks model this as a non-maturity deposit with an assumed behavioural life, replicated with a portfolio of fixed-rate assets:
What the symbols mean
- Va value
- ta point in time
- rthe interest rate, per year
- ythe yield to maturity
The value of the deposit franchise is the discounted spread between what the bank earns on the money and what it pays for it, over the balance's assumed life. That is the number bank valuations turn on.
The assumption that breaks
- The replicating portfolio assumes deposits are sticky and that duration risk is hedged. Get the first right and the second wrong and rising rates produce unrealised losses on the asset side against liabilities that can leave instantly.
- Digital banking compressed the run timescale from days to hours: balances now move at the speed of an app notification, while the asset side still liquidates at the speed of a bond market.
- Uninsured deposits are the fast money — concentrated, professionally managed, and the first to leave. The insured/uninsured mix is the single most informative line in a bank's funding disclosure.
Where it sits in the product spectrum
Moving out from the deposit: a certificate of deposit trades access for a fixed term and rate; a money market fund trades the insurance for diversification and market-linked yield; a T-bill replaces bank credit with sovereign credit. Each step exchanges one specific comfort for one specific improvement.
The formulas above are standard textbook formulations, simplified for teaching. They explain the mechanism — they are not a valuation tool, and they will not reproduce a dealer’s price.
5 · Desk notesHow practitioners think about it
Now say it back
Close the page and give Savings Deposit in four sentences. It takes a minute and it is the only way to find out whether reading it was enough.
- Who wants what — two parties wanted opposite things badly enough to write it down.
- What the contract obliges, and when — not the payoff; the obligation.
- Where the money comes from — name the source, or you have described a hope.
- What makes it lose — the ordinary way, not the dramatic one.
Put Savings Deposit beside any other instrument →
Where this instrument shows up elsewhere
- EasyBranch & Relationship BankingIndustryThe bank a household actually meets — and the narrow set of things the person across the desk is allowed to decide
- EasyDeposit vs. Money Market Fund vs. T-BillCompareFour ways to hold cash, each trading one specific comfort for one specific improvement
- EasyRegulation & Investor ProtectionConceptsWhat actually stands between you and a loss when a firm fails — and the large gap between being protected and being…
- EasyThree Places Cash SitsCompareA deposit, a money market fund and a short government bond all look like holding cash
- MediumDeposits & PaymentsIndustryHolding the money and moving it — the cheapest funding a bank has, and the part of it that can leave in an afternoon
- MediumNorthern Rock, 2007Case StudiesA solvent lender that could not refinance
- MediumThe AT1 Write-Down, 2023Case StudiesCHF 16bn of bank capital instruments written to zero while shareholders below them received stock