If you've been following mortgage rates over the past few years, you'll have noticed something peculiar. The Bank of England base rate sits at 3.75%, yet the average five-year fixed mortgage comes in at 4.81%, whilst two-year deals hover around 6.6%. That gap between what the central bank charges and what your lender actually costs you isn't random. It's partly shaped by something most homeowners never think about: government spending and budget deficits.
For decades, a basic rule of thumb governed financial markets. When governments spent more money than they collected in taxes, they'd eventually tighten their belts. The deficit would narrow, borrowing costs would fall, and stability would return. That cycle kept things predictable for savers, borrowers and investors alike.
But something's shifted. Governments across the developed world, including the UK, have largely stopped following that pattern. They're running large budget deficits year after year without the corrective tightening that used to follow. And remarkably, bond markets haven't punished them as harshly as economic textbooks would predict.
What this means for your mortgage
You might wonder why this matters when you're trying to refinance or buy your next home. The connection is direct. When governments borrow heavily without clear plans to reduce spending, it affects the cost of borrowing across the entire economy. Mortgage rates don't just respond to the Bank of England base rate. They're also influenced by what investors expect from long-term interest rates, inflation and government debt levels.
Right now, that uncertainty is baked into the rates lenders offer you. Your mortgage isn't just paying for a house. It's pricing in the risk that years of government deficits might eventually push inflation higher, or that central banks might need to hold rates elevated for longer to maintain stability.
The UK average house price sits at £271,295, and annual price growth is tracking at 2.7%. Those figures depend partly on mortgage affordability. When rates are sticky because of macro-economic uncertainty, fewer buyers can stretch to purchase. That dampens demand and keeps price growth modest.
Why bond markets haven't panicked yet
You might expect that loose government spending would trigger a market revolt by now. Investors would demand higher interest rates to compensate for the risk, and borrowing costs would spiral. In reality, it's more complicated.
Bond markets are large and patient. They've absorbed government debt at relatively stable yields so far because inflation remains under control at 2.6%, and because expectations about future growth keep shifting. When growth worries rise, investors actually buy government bonds for safety, which pushes yields down. When growth looks stronger, bond yields rise. The dance between confidence and caution has kept rates from doing anything dramatic.
But there's an implicit trade-off at play. As long as governments don't shock the system with sudden policy changes or inflation surprises, this stability can hold. The moment that changes, though, borrowing costs could move sharply.
What should you do now?
For homeowners considering a remortgage, the key question is whether current rates feel sustainable to you. At 4.81% for five-year fixes, you're paying a significant premium over the base rate. That premium reflects the market's caution about the future, not just your personal credit risk.
If you're buying, focus on what you can actually afford at current rates, not what you might afford if rates fall. Government spending and deficit patterns tend to shift slowly and unpredictably. Betting on a sharp drop in mortgage costs is risky.
If you're selling, remember that the housing market's relative stability right now is partly because most buyers have either locked in lower rates years ago or adjusted their expectations to current affordability. That's created a more balanced market, even if prices aren't soaring.
The bigger picture is this: prudence in government spending has fallen out of fashion, but that doesn't mean the financial system is ignoring it completely. Instead, uncertainty about how long this can last is quietly embedded in every mortgage rate you see. Understanding that connection won't change what you pay, but it might help you make better decisions about timing and borrowing.