"Net" is the standard spelling (net price, net profit). "Nett" is an older British variant that still appears on price tags in the UK, Singapore, Malaysia and India — recognised by dictionaries, but use "net" in your own writing.
Write 'net' — always safe, standard everywhere.
'Nett' = older British variant, still seen on bills and price tags.
American English never uses 'nett'.
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Net is the standard spelling everywhere — net price, net weight, net profit (the amount after deductions).
Nett is not a mistake: it is an older British variant that survives on price tags and invoices in the UK, Singapore, Malaysia and India ("$10 nett"). Dictionaries list it as a variant of net.
Use net in all