@jimtony since you entered the country on 5/29/2021, 5/30/2021 ( the first full day in the USA ) is when your presence counting starts. Thus any earnings before that day is not subject to US taxes ( you did not exist for US tax purposes ). So you became resident for tax purposes sometime in Nov 2021 ( exact date depends on when you reached 183 days present in the USA) implying you were technically a dual status person. Thus till the date of passing SPT ( 183 days present in the USA ) only US sourced income is recognized for US tax purposes. IF you have had no other income then your off-site/remote work for your Norwegian entity for the year 2021, then all earnings ( i.e. before 5/30/2021 ) are not recognized for US purposes. Thereafter till passing the SPT ( Nov/XX/2021 ) only US sourced income ( i.e. earned while working/executing in the USA ) is taxable to US. From the SPT date ( i.e. passing SPT) onward your world income ( foreign and domestic ) are taxed by the USA.
Thus in your particular case ( based on all that you have posted so far ) for a joint filing, your income before entering US, is not subject to USA taxes and are not recognized on your return. Thereafter you recognize your income ( from remote working ) as US sourced and taxable to US.
Note that you do not file a new return for the joint one filed for 2021 -- you amend the return updating the income sourced to US during the period 05/30/2021 through 12/31/2021. If Norway also taxed you on this portion of income, then you claim foreign tax credit for this ( you essentially have to resource this for purposes of form 1116) or plead with Norway to return the taxes paid because you were not a resident there ( form 8802 for IRS certificate 6601 ) as discussed earlier. For this amended return you may be able to do it yourself, IMHO
Also note that because you were a remote worker, you enter yourself as a self-employed -- use Schedule-C. This will allow you to recognize the income and also deduct any associated expenses --related to this income stream ( see IRS docs on self-employment income ) ---> https://www.irs.gov/businesses/small-businesses-self-employed/self-employed-individuals-tax-center
This will also mean that you have to pay FICA tax equivalent ( called SECA at 15.3 % of net income ).
Does this make sense ? If you need more help on this , you are welcome to add to this post or PM me --- but no personally identifiable information please ( even in PM -- PM just allows a fuller discussion that may be specific to your case and of not general interest )
pk
