No problem with that, but it is not my fault if I am new to the country and I earned my living elsewhere in the past. That's all the paper I have now, that's how I make my living.
You may already know what you need to know about getting residency, but since you used the term "partner" instead of husband or wife I will add the following:
If you are married to an Argentine you will be able to apply for permanent residency here and you income will not be a factor. If you are not married you may be able apply for residency based on your foreign income.
Based on my own experience as well as everything I've read in this forum, migraciones doesn't ask for tax returns from foreigners applying for residency based on income earned in another country. They want bank statements, leases, and/or other "legal" documents that substantiate the foreign income.
If you are still earning your living in another country after you arrival it will be "subject to taxation in Argentina once you establish residency here. In the past it wasn't possible to get temporary residency based on "active" foreign income, but someone recently included active income as a way of qualifying for the visa "rentista" (possibly in the thread "Immigration for Dummies").
If you and you partner get married in Argentina you won't have to deal with the income issue as far as migraciones is concerned, but your continuing foreign income (certainly any you transfer to Argentina) will be taxable here (in addition to the 21% IVA that is included in the "price" of all goods and services with the exception of used items purchased from another individual), making the effective average tax rate about 40% for a foreigner paying 17% tax on their foreign income.
Please keep in mind that the average Argentine salary you referred in your first post is take home pay and the employer pays taxes on top of that.
I know you did not ask about this, and you may already know everything I've added here.I'm including it in case you did not and/or in case it is useful information to anyone else in a similar situation. Many (if not most) foreigners arrive in Argentina knowing very little about these issues and I was once one of them.