You're still responsible.
Tell each company how much to withhold.
If they take too much, you get it back when you file taxes.
If they don't take enough, you pay a penalty for having too large of a bill when you file.
The issues you mention exist regardless of how many employers you have, because you can have income that does not come from an employer (e.g. stock dividends).
What's the big difference? You don't need a tax preparer to do your taxes in the US, and if all you have is a normal W-2 income and a bit of bank interest its a pretty simple couple of forms to file.
The simplest cases, however, don't really require filing forms at all. The withholding process sounds similar, and when the time for filing taxes comes, you get a pre-filled return sheet with withheld taxes and your pre-calculated actual tax based on the information the tax office has.
Employers directly report income to the tax office, so that information is already included. Banks also automatically withhold taxes on the interest they pay and report it to the tax office. I think banks and broker companies usually report sales of stocks etc. made through them as well.
The same pre-filled return sheet includes national and local income taxes that have been automatically calculated based on your place of residence. (I assume this is more complex in the US due to different state legislations; here the tax legislation is the same everywhere even though local tax rates vary.)
If you don't want to add deductions (in addition to standard ones) and you don't have any corrections to make, you don't need to file any forms. The only things you need to do are to pay the difference if you owe something or to report your account number for a refund if they don't have it already. Otherwise filing in a simple case is a no-op.
If you do want to file for deductions or make corrections, you can do that with an online form.
And of course you still do want to check that the pre-calculated information is correct and whether there are any non-automatic deductions for which you're eligible.
More complex cases are, well, more complex. If you've got income from renting an apartment, for example, you do need to report that information yourself. But it's still a relatively simple online form.
Real estate tax is handled separately from income tax. You get sent a bill with a pre-calculated sum based on property registered in your name. If you have no corrections to make, you just pay the bill.
In contrast, I think even small businesses commonly hire accountants since for them the process is probably more complex with all the deductibles etc.
If the simple cases are similarly simple in the US and making corrections is a relatively straightforward form away, I wonder why there always seems to be such a big fuss in the US about filing taxes. Because of state/local differences in tax code? Just overall complex legislation? Or maybe it's just more common to have income from a variety of sources so more people need to deal with the more complex cases? Is the filing process paper-only and the only way to do simple online filing with automatic calculation to go through commercial tax-filing software?
At the end of the year you file online and put in your deductions, which hopefully cover any other taxable income (capital gains, dividends, interest, etc.) if you didn't give your employer a higher figure. Then you pay if you're owing or get a refund if not.
In Australia, you probably need to tell the companies about the other income sources, and they will attempt to withhold at the appropriate rate. Then at the end of financial year, you go to your pre-filled online tax return which has all the figures reported by each company you work for already present and sums up whether there’s a refund or payment due. This is also where you enter any deductions.
That implies the government would know significantly more about my life and my day to day affairs. That sounds like it would be a privacy nightmare.
They're suggesting letting the irs actually use the resources they already have to automate the vast majority of the people's taxes to save everyone time and money.
It doesn't have to be perfect to be a huge improvement.
(Also it’s rather ironic that people who think like you have been voting for the party which is currently enabling Palantir to build Chinese-style surveillance in America. But as long as the data is owned by billionaires and they promise to only use it against the “others”, I guess it’s fine.)
That would be simple enough for most people (1 job, 1 home, maybe some kids) and it doesn’t require the government to know anything additional.
In that most common scenario no tax accounting service should be needed. Honestly a 1040 isn’t that complicated in that scenario either, but is still too difficult for a good number of people and it’s just unnecessary.
And if all you have is a W-2 you don't experience most of the complexity of filing as it stands now anyway.
Whereas I guess American Exceptionism (tm) means you all have to pay a rent seeking company to file taxes…?
It is not that rare at all for Europeans to have other sources of income, and thus to have to file their own taxes.
In the US, if you just have wage/salary income and an investment account, and you lived the entire year in one state, your taxes are also very simple. You can fill everything out yourself in one evening, or pay $100 to do it with tax preparation software.
But things can rapidly get complicated. Did you move from one state to another during the year? Do you live in one state but work for an employer in a different state? Are there any credits or deductions you're eligible for? Or god forbid you live abroad, at which point you're dealing with double-taxation treaties and the like.
They already do that -- if you calculate your taxes wrong, they will send the adjustment (they will do it both ways, pay you back or ask for the remainder). I guess they might not be aware of all the deductions, but standard deduction beats itemized one for the majority, so they can 100% automate this whole process if they decide to. For complex cases and businesses, sure, you are on your own, but at least most W2 should be covered.
Presumably much less if one pays more than the IRS calculates is owed.
Essentially both the IRS and tax filers verify correctness of the tax filer's return and the tax filer can be prosecuted if they make a mistake according to the IRS.
How is this an issue? Why would it be different under another system?
I see you posting a lot of what I think are pro-tax-prep messages but they don't seem to have any substance. Please try to take them to the conclusion of an argument. (That is, finish by connecting the facts you are posting with some assertion about the desirability of the current system, or some assertion the parent has made.)
What I mean to highlight is that although a mistake in filing may lead to the IRS rectifying the mistake by sending/requesting the error balance, there are other possible effects, including civil and criminal liabilities.
This is undesirable. As mentioned in many comments here, the vast majority of filers, especially those with one employer and no substantial investment income, should not be required to file their taxes and instead the IRS should communicate the calculation result and ask if the filer disagrees.
This is a classic problem related to the "you slice, I choose" false dichotomy[0]. Essentially, even assuming it costs zero time to fill out and file a tax return, any mistake at all could lead to a negative consequence to filer.
As an aside, always choose to choose and not to cut the cake :)
Failing to report income or reporting false information for financial gain can lead to extra tax or prosecution for tax fraud where I live. I'd definitely be careful to report all income if I had income from sources that don't automatically withhold taxes, especially if it were significant.
I don't think they'll drag you to criminal court if you make a small mistake, though. But if you fail to report thousands of euros of income and the authorities get wind of it, sure, especially if it seems intentional.
I don't know if the risk of prosecution or other legal consequences is somehow greater in the US.
Here in Australia everyone must fill in an annual return, but it’s a fairly well automated online system and they’re probably already already have most of the fields filled in, you just need to add anything more complicated or any deductions you think you’re owed.
In both systems you can have an accountant file for you, or use other software, but you don't need to and most British people will never file a single return in their lives.
IRS Direct File[1] did exactly this. It apparently worked really well, and people liked using it, netting ~$20 billion in savings to the Americans that used it (roughly half of that came out of the pockets of the tax-prep industry).
Then, DOGE got to it and the new administration's IRS commissioner killed the program.
Taxes are simple if you live in one place and only receive income from your employer. If you have multiple sources of income, connections to multiple countries, etc., things can get very complicated very fast. That's why the tax prep industry exists - and not just in the US.
That being said, the Internal Revenue Service could prepare the taxes of most Americans. A simple system of, "Here's what we think you owe, based on the information we have on hand - sign and submit if you agree" would work for most people.