Poland's statistics office: September inflation jumps to 4%, the worst reading in over a year
On Wednesday, 30 September 2026, Poland's Central Statistical Office (GUS) published its flash estimate of September inflation — and it is not good news for household budgets. Consumer prices rose 4.0% year-on-year, up from 3.4% in August. This is the sharpest monthly acceleration in the CPI reading in over a year, and the figure surprised even analysts polled by PAP Biznes, who had expected 4.1% — so the actual print came in only marginally better than forecast, but the sheer size of the jump is striking. On a month-on-month basis, prices rose 0.7%.
For an ordinary saver, this is not an abstract statistic. It is a concrete signal: money sitting in a non-interest-bearing account, or simply at home, is losing value faster than it was just a month ago. It is worth looking at this more closely, because the September reading carries real consequences — both for savers and for borrowers.
Fuel is public enemy number one
The biggest driver of the increase was fuel prices, which rose by more than 36% year-on-year (precisely 36.1% y/y, 9.2% m/m). This is the result of several overlapping factors — conditions on commodity markets, the zloty's exchange rate, and excise-duty changes that have been phased in gradually throughout the year. Fuel prices have a way of feeding indirectly into the cost of almost everything else — freight, courier services, and ultimately shelf prices. That is why September's CPI jump is not an isolated event, but a signal that inflationary pressure could persist for several more months.
It is worth noting this is only a flash estimate — the full, detailed breakdown of inflation (how much food, energy and services rose) will be published by GUS on 14 October. Only then will we get the complete picture of exactly what is driving prices higher.
The central bank under pressure: a November rate hike is now in play
This reading needs to be read alongside what happened a couple of weeks earlier. At its 8-9 September meeting, Poland's Monetary Policy Council (RPP) decided to hold interest rates steady — the NBP reference rate currently stands at 3.75%, the lombard rate at 4.25%, and the deposit rate at 3.25%. Even then, economists noted that inflation approaching the upper end of the NBP's target band effectively ruled out further cuts. Now that CPI has broken through 4%, the scenario has shifted from "rates on hold" to "rates under upward pressure."
Economists at Credit Agricole do not rule out a 25-basis-point rate hike — to 4.00% — as early as the RPP's November meeting, following the publication of the NBP's new inflation projection. That is a meaningful change in narrative compared with what we were hearing in spring and summer this year, when the conversation was mostly about room for further cuts. If that scenario plays out, it would be Poland's first interest-rate hike in a long while — and it is worth preparing for consciously rather than being caught off guard.
What this means for your savings
With higher inflation, the real value of money sitting in a non-interest-bearing account erodes faster. If you have cash set aside that you had been planning to place somewhere, September is a good moment to act deliberately rather than keep putting the decision off. As long as NBP rates stay at their current level, deposit and savings-account terms at banks still reflect that environment — but a potential November hike could feed through into changed offers in the coming weeks. Before choosing anything, it is worth comparing current fixed-term deposits available across banks, and checking how savings accounts stack up against them — the latter can be more convenient when you don't want to lock money away for a fixed term, and flexibility matters right now, since the interest-rate environment could shift faster than expected.
Whatever you decide, the key rule stays the same: compare the real, after-tax interest rate against current inflation. If the rate is clearly below 4%, your savings are losing purchasing power even if the balance is nominally growing.
What if you're repaying a variable-rate loan?
The flip side concerns anyone repaying a loan, especially a mortgage, on a variable rate. Higher inflation raises the odds of an NBP rate hike, which directly feeds into the reference rates that determine your monthly instalment. If you're planning to take out a mortgage in the coming months, it's worth comparing mortgage offers now — both variable and fixed-rate — before a potential November RPP decision affects the terms of new agreements. Those already repaying a loan shouldn't panic — a single 25-basis-point hike is a relatively modest change to a monthly payment — but it's worth tracking the situation actively rather than finding out from a bank statement.
What you should do
September's inflation reading is a signal to review your finances before the market does it for you. A few concrete steps for the days ahead:
- Check how much you're really earning on your savings after inflation and tax — if it's below 4% net, your money is losing value.
- If you have spare cash, consider placing it now rather than waiting for the outcome of the November RPP meeting — conditions could move in either direction.
- If you're planning a mortgage, compare fixed and variable-rate offers before a potential rate hike feeds into new bank offers.
- Watch for RPP statements and the full GUS data due on 14 October — only then will it be clear whether September was a one-off spike or the start of a more lasting trend.
Whether you're saving or repaying a loan, the worst strategy is to do nothing. Compare current fixed-term deposits, check the savings accounts available on the market, and make a deliberate decision — before rising inflation makes it for you.