No. 01 · Illustrative example · example rate £1 = Rs 375
The three-day mystery
How money crosses borders
Works in Manchester and sends money home to his mother every month.
At the example rate, £500 is worth .
No. 02 · Ledgers · Illustrative example
Money never travels
A message travels. Each bank updates its own ledger.
Balances
Entries · Dr = debit, Cr = credit
Balances
Entries · Dr = debit, Cr = credit
Nostro
Our money, held at your bank.
Northgate's name for its rupee account at Indus. It is an asset on Northgate's books.
Vostro
Your money, held at our bank.
Indus's name for the same account. Indus owes that money to Northgate.
No. 03 · Payment message · Fictional codes
The message that moves
Eight fields tell every bank what to do.
A richer message standard
Banks send these messages over Swift, a network linking more than 11,500 banks and securities firms in more than 200 countries and territories.
On 22 November 2025 the old MT format stopped carrying cross-border payment instructions. Every payment now uses ISO 20022, a standard with room for full names, addresses and the purpose of a payment.
No. 04 · Correspondent banking · Illustrative model
The correspondent chain
When two banks share no account, other banks pass the payment along.
Illustrative model. A direct payment takes about 2 hours. Each intermediary deducts £10 and adds 6 hours if the payment reaches it before its daily cut-off, 18 hours if after. Before or after is drawn at random with a fixed seed, so every run is the same.
Why not always go direct? Every account a bank keeps abroad has to be funded, checked and maintained. So banks hold a few and reach the rest of the world through their correspondents.
No. 05 · Cost of sending · Illustrative model · example rate £1 = Rs 375
Where the fees hide
Some fees are printed. The biggest one hides in the rate.
Bars drawn to scale on an axis that starts at £440, so the small fees stay visible. Rupee amounts are shown in pounds at the mid-market example rate.
Who pays the fees
Correspondents
Reference lines: average cost of sending $200 worldwide, Q1 2025 (World Bank). Fixed fees weigh more on smaller amounts.
No. 06 · Time zones and cut-offs · Illustrative model
Why it takes days
Most of the trip is spent waiting for a bank to open.
Bilal sends on (UK time)
Bank openDaily cut-offWeekendBank working on itWaiting
Illustrative model on fixed clocks (UK +0, UAE +4, Pakistan +5 hours from GMT). Open hours: UK 09:00 to 17:30, cut-off 15:30, 2 hours of work. UAE 08:00 to 16:00, cut-off 13:00, 2 hours. Pakistan 09:00 to 17:00, cut-off 14:00, 3 hours. A payment that reaches a bank after its cut-off waits for the next business day.
Swift reported in 2024 that 90% of cross-border payments on its network reach the receiving bank within an hour. Only 43% reach the customer's account that fast, because the last bank's own checks and hours still apply.
No. 07 · Settlement
When money becomes final
Banks settle with each other at the central bank.
United Kingdom · £
No central bank sits over both countries. The link is the nostro account from scene 2, an ordinary balance held at a bank. Each country's leg settles on its own.
Pakistan · Rs
- What it holds
- Who keeps the ledger
- What a payment does here
No. 08 · Recap
Next time a transfer takes three days, you will know where it is waiting.
- LedgersMoney stays put. Banks edit balances.
- MessageEight fields, one standard.
- ChainEach extra bank adds a fee and a wait.
- FeesThe rate hides the biggest cost.
- ClockCut-offs and weekends add days.
- SettlementFinal at the central bank.
Sources: Swift, press release on completing the switch to ISO 20022 (November 2025); Swift speed data as reported by PYMNTS (October 2024); World Bank, Remittance Prices Worldwide, Q1 2025 report; Bank of England, introduction to RTGS and CHAPS; The Paypers, on the State Bank of Pakistan's PRISM. People, banks, codes, fees and the exchange rate are fictional examples.
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