You need more than two incomes worth of salary in any country that does income tax bands. In the UK, two people earning 30k each will take home a combined 50k. A single person needs to earn almost 70k to take home the same. And for council tax you end up paying 75% of what an entire household would pay.
In the US, two moderate incomes see a similar federal tax bill to a single person, with things actually getting worse at higher incomes for the married couple. Is the UK tax code really that different?
Huh? In the US the married filing jointly tax brackets are exactly double the single tax brackets for every rate except the top 37% rate. A single person making 100k definitely pays a lot more in tax than than a married couple making 100k together. It's generally advantageous to be married filing jointly unless you're at the absolute top 37% rate, at the very bottom (where means tested benefits phase out), or both spouses make roughly equal incomes (in which case MFJ vs two single filers works out around the same).
In your $100K scenario, that single person pays about $6K more in taxes, but has $36K more in take home pay per person, so that additional tax bill seems reasonable in light of their ability to pay it and pay for their cost of living.
You’re moving the goalposts. The point is the tax bill, not “ability to pay per person.” On 100k total, MFJ owes thousands less in federal income tax than a single filer at 100k because the standard deduction and brackets are basically doubled. That’s exactly why marriage is usually a bonus at moderate incomes. The “marriage penalty” shows up mainly when both spouses have high, similar incomes/phaseouts, not in the $100k total case.
