I’d go further than that and roll employer national insurance into personal taxes as well so that there’s proper transparency over what people are actually paying.
From an employer’s perspective they do not care which part of the taxation is classified as their tax or the employee’s tax. All they look at is “what will be the total cost of me hiring this person including all salary, taxes, pension contributions etc?”.
Effectively - as we saw last year - employment taxes levied on employers are paid by the employee. If you raise the employment taxes on the employers they can still only afford to pay the market rate for the individual so this results in lower salary rises in future until the money is recouped, or reducing any pension contributions that they give to employees above the legal minimum, or not hiring new staff and increasing workloads for existing staff instead so they work more hours for free, or if none of that recoups the money then they make redundancies. The employee is always the one that will pay because the employer cannot continue to operate if they make no profit.
the 15% NI charge to employers is therefore also in everything but name another tax on employees. All of this should be rolled into income tax so that the electorate can actually see how much they are being taxed. The marginal tax rates at certain points in salary scales already exceed 100%!! This has been shown in independent economic studies to be one of the main drivers of low productivity and growth in the UK (therefore falling living standards). These studies were even reported in The Guardian for goodness sake, so hardly right wing propaganda or whatever, they are economic fact. You can see in HMRC data the bunching of taxpayers below each threshold where punitive marginal tax rates are imposed at various levels with withdrawal of child benefit, the imposition of student loan repayments, the withdrawal of the personal allowance and childcare funding, and the much too high withdrawal rate for universal credit for those working in low-income roles which makes it not worth them taking on additional hours.
All of this results in lower economic participation, skills shortages, higher immigration needs, lower tax revenue, lower productivity, higher welfare bills and lower growth. And higher inflation as well.
This is all entirely within the Chancellor’s gift to fix immediately in this budget by removing the cliff edges and there is robust evidence that within months this would give the UK economy a huge boost and actually raise tax revenues.
Instead, her proposal is to introduce more cliff-edges and more totally illogical, irrational variations in marginal tax rates that will create perverse incentives and harm economic growth further by screwing around with applying extra tax charges to pension contributions. This will, quite obviously, exacerbate these already clearly-evidenced economic effects and make the economy tank further.
You really couldn’t make it up.