In the UK most people are on the "pay as you earn" (PAYE) system. Income tax is deducted from your monthly or weekly pay before you get it and sent to the revenue by the employer. If you're self-employed you have to make an annual tax return.
Same here, and you have to make an annual tax return before April 1 when you have more than one source of income, own a house and things like that. Most people here e-file nowadays.
In the UK the system requires an annual tax filing - although if you are a permie employee and paye via PAYE the tax office with no 'special issues' the tax office usually advise that there is no need to file separately. They make the adjustments via the PAYE.
This is a bit of a change from the situation less than 10 years ago - like Canada all earning adults then had to file tax returns either manual or on-line. They must have got sick of the workload.
Of course, if you are a non-dom or a banker boy, they call round in person with a wheel barrow of free cash and a doffing of caps..
Quite miss the mad dash annual rush to funnel as much as possible out of the way into RRSPs !