Silly financial mistakes made by six figure earners

In my experience, the biggest mistake is assuming a high income makes you wealthy. It often just funds a bigger lifestyle, with little building up behind it. The classic trap is the £100,000 to £125,140 income band, where the personal allowance is gradually withdrawn and every extra pound can be taxed at an effective 60%. Many do not realise they are even in it. Pensions are another blind spot. People either ignore the allowances open to them or breach them without noticing, and few revisit old pots left with former employers. Estate planning is the one most put off. There is a tendency to assume inheritance tax is a problem for other people, until it lands on the next generation. And despite earning well, a surprising number have little protection in place. A large income usually means large commitments, and those do not pause if the income stops

One of the biggest mistakes six-figure earners make is assuming high income automatically means good financial planning. It does not. Some earn a lot, spend a lot, pay unnecessary tax, underuse pensions, ignore protection and still have no real strategy. The danger is lifestyle drift. A better salary quickly becomes a bigger mortgage, private school fees, cars, holidays and subscriptions, but wealth is not built by income alone. It is built by structure. I also see higher earners delay estate planning because they feel “too young” or assume it is only for the ultra-wealthy. By the time they look properly, pensions, property, business assets and life cover may already create a major inheritance tax or liquidity problem. The smartest clients are not always the highest earners. They are the ones who turn income into assets, protect the household, use tax allowances properly and build a plan before complexity starts controlling them.

We regularly speak to higher earners who miss credit card payments, have arguments about phone bills or water bills, or have unpaid parking fines. While they take a moral stand on the bills and any discrepancies, their credit reports often suffer, which means they struggle to qualify for the cheapest mortgage deals because of the credit blips on their credit reports. It is also not unusual for people to then move home without putting their post on divert, which means they do not get the unpaid bill letters, which then can escalate to CCJs. Missed payments and CCJs are major red flags these days for many of the bigger banks and building societies, which means borrowers have to turn to adverse-credit lenders and pay considerably higher rates. It does have an issue with a phone company or utility firm. It is best to pay the bill and then try to get the money back where possible. Adverse credit rates are much higher, meaning borrowers could end up paying far more than necessary for years.

Six figure earners often assume they have outgrown basic tax planning, when in reality the tax system becomes more punishing just as earnings rise. The classic mistake is drifting over £100,000 and sleepwalking into the 60% effective tax trap as the personal allowance is withdrawn. Pension contributions can be a highly effective way to bring adjusted income back below that line while boosting long term wealth. Landlords can make a similar mistake with buy-to-let debt, holding property personally and losing full mortgage interest relief, when a limited company structure may allow finance costs to be offset more fully. These are not clever loopholes; they are basic housekeeping. But ignored, they can quietly cost high earners thousands.

Lifestyle inflation catches up to more six-figure earners than almost anything else. Every promotion brings a bigger mortgage, a smarter car, more expensive holidays and higher monthly expenditure. From the outside, they look wealthy, but behind the scenes, some are saving less than expected and relying heavily on future income growth. The people who build lasting wealth are often not the highest earners, they're the ones who avoid turning every pay rise into a spending increase.

For high earners, the biggest money mistakes are rarely bad investments, they're missed planning opportunities. Many fail to fully utilise ISA allowances, pension contributions and carry forward, or overlook capital gains tax planning, leaving thousands of pounds of tax savings on the table each year. Another common issue is focusing on building wealth while neglecting the foundations that support it. High earners often have significant mortgages, school fees and lifestyle commitments but inadequate income protection, life cover or critical illness cover should something happen to them. Estate planning is another blind spot. Outdated wills, missing Lasting Powers of Attorney and unreviewed pension nominations can create significant problems for families. Many also miss opportunities to build intergenerational wealth by not using Junior ISAs and Junior Pensions for children. Disciplined planning focusing on protecting, preserving and passing on wealth are as important as creating it.

Six-figure earners and high-net-worth individuals are as prone to making costly, avoidable financial blunders as the rest of us. Just because someone earns a big salary does not automatically mean they are money savvy. Before I launched my own business, I worked at a brokerage where the Head Trader was paying monthly Direct Debits for five mobile phone contracts that were all obsolete. More common mistakes include falling into structural tax traps, particularly the effective 60% marginal tax rate applied to income between £100,000 and £125,140 as the Personal Allowance tapers away. Many also neglect the Tapered Annual Allowance on pensions, triggering surprise tax penalties. Sometimes it’s just ‘keeping up with the Joneses’ where prestige leasing and luxury spending leave little liquid runway if income stops.

The most expensive mistake high earners make is rarely a bad investment. It's assuming that because they have an accountant, a pension and an ISA, someone is joining the dots. In reality, important opportunities are often missed. Pension carry forward allowances go unused. Child Benefit is lost because nobody noticed the income threshold had changed. These are not complex strategies. They are basic planning issues that fall through the cracks when advice is fragmented. Inheritance tax is another growing concern. Many people built their plans on the assumption that their pension sat outside their estate. From 2027, that will no longer be the case. Add frozen nil rate bands and rising property values, and families who never expected an inheritance tax problem are discovering they have one. The issue is rarely a lack of options. It's a lack of coordination.

Not realising that they are often getting 38p for every £1 they earn on the portion of income between £100k and roughly £125k. This can sometimes just be because of a bonus. That same bonus for those with young kids loses them the ability to claim £2000 tax relief off their childcare and 30 hours free childcare a week. They end up worse off! Instead, they could sacrifice that bonus into their pension, and potentially benefit from some or all of the employers national insurance savings, which could be up to 15%. So, 38p in your pocket or £1.15 in your pension, along with £2000 a year per child for childcare, and 30 hours a week of free childcare. On the other end, we see very high earners putting too much in their pensions. Not realising their annual allowance is tapered and doing this for a few years they end up having to pay annual allowance charges.

The biggest wealth killer for six-figure earners isn’t tax, investing or pensions—it’s complacency. A high income is incredibly forgiving. It allows bad financial decisions to go unnoticed for years. By the time many people realise they’re not building wealth, they’ve already spent a decade funding a lifestyle instead.

Top 3 ideas

Should you overpay your mortgage or your pension? Many higher earners focus on clearing their mortgage early, but pension contributions can often be more rewarding. Tax relief can be worth 25%, 66% or even 150% for those caught in the £100,000 to £125,140 tax trap.

The hidden tax trap for six-figure earners. Income above £100,000 triggers the gradual loss of the personal allowance, creating an effective 60% tax rate until £125,140. Thousands pay more tax than necessary simply because they do not understand the rules.

How couples can legally pay less tax. Many households have one spouse paying higher-rate tax while the other has unused allowances. Simply holding assets in the right name can save thousands and make better use of available tax allowances. Some non-working spouses can receive up to £18,570 tax-free using available allowances and the appropriate financial products.