Prices display different value for a registered user and guests

Hi,

I have a problem that my products show different price between a registered user and guest.
e.g if a product costs €10 without TAX and a tax is 10% it means tax is 1 which gives final price of €11
A registered user sees €11 and a guest sees €10 for the same product.

How do I make guests see correct price incl. Tax?

There could be many reason for this, such as Tax Exempt by role, or because Guest customer does not have address info (which may be used to calculate tax).

But I never seen an eshop before showing different prices for guest users because they dont have address. I think it is normal for guest to not have address.

I am not saying that it is. I am just saying it could. My answer to you really was: there could be many reasons why this is happening, depending on the settings of your stores. :)

Thanks for your reply and help.

Can you point to which settings do I need to change so that registered and guest always see the same price (which includes tax)?

Thanks

Check here that no roles are tax exempt
And here in Advanced mode, specially in Tax Based On

Also, could happen if you have multiple currencies.