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Sorry, I couldn't wish you on time. So I have to say happy belated birthday to you.

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'Wish you' requires an object.

Sorry I couldn't wish you 'Happy Birthday" on time. So I have to say "Happy Belated Birthday" to you.
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CliveSorry I couldn't wish you 'Happy Birthday" on time. So I have to say "Happy Belated Birthday" to you.
But the birthday was not belated; the wish is. So logically one should say something like the following.
'I couldn't wish you a Happy Birthday on time. So I belatedly wish you a Happy Birthday.

If "belatedly" sounds too odd, we can say one of the following.

'So I give you my belated Happy Birthday wish.'
'So I am wishing you a Happy Birthday a little late.'
Site Hint: Check out our list of pronunciation videos.
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Thanks.
 canadian45's reply was promoted to an answer.
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JimmyH Sorry, I couldn't wish you on time. So I have to say happy belated birthday to you.
Are there any errors?