How many years back can I get a tax voucher?

Tax vouchers are available for the prior 3 years.

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Why were my stock sale proceeds withheld for taxes?
How do I request a dividend tax voucher for Austrian, Belgium, Danish, Norwegian, Swedish or Swiss stocks and tax voucher for Great Britain Property Income Distribution?
How do I request a dividend tax voucher for German stocks?
What is the withholding tax applicable to French dividend payments?