A tax period define a period of time over which a company tracks tax. This is usually used for VAT/GST reporting and submission in your country of operations. ·       The following NetSuite editions use accounting and tax periods: o  Australia edition o  Japan edition o  UK edition o  International edition o  OneWorld (any edition, if there is a VAT/GST nexus) ·       The following NetSuite editions use only accounting periods: o  US edition (not OneWorld) o  Canada edition (not OneWorld) ·       If your account is a US edition or Canada edition OneWorld account, the Manage Tax Periods page will be accessible only when you add a subsidiary or nexus that uses VAT/GST.

You could also type Tax Periods into the Help menu

@C_Billings Tried it already before reaching out to them but did not get the same answer that I was looking for. I understand and do support looking up suiteanswers or help article is the best route before checking with Support but sometimes they give you suiteanswers or help article that you might miss... And also, they have some internal documentations that sheds some more light on the topics of your interest and to your specific use case.

Its literally the first thing that pops up

@C_Billings I was not active here lately so could not reply earlier. But to give you more context - I checked in SuiteAnswers directly with the entire error; not just the keyword "Tax Period" like you did in the Help article section.. We do get answers or some hints in the SuiteAnswers so I mostly check errors directly there... Also, more importantly, this is a once a year activity (adding of periods in NetSuite) so it is easy to forget that you need to add two different kinds of periods in NetSuite backend like for our case..so in my mind I did not even think at that point that there were two different kinds of periods.