I seem to say this every single year, but if you're a writer, and if that is your career, then take the home office deduction. You can, in fact, deduct anything one might find in an executive office if you take the home office deduction. I have a very large-screen TV and audio system in here, which I deducted. I have custom-built cabinetry and this desk, which I deducted (or depreciate, I can never get that straight and leave it to my accountant). My computer is here at my desk; I also have a laptop. Two very good printers, one of which is also my dedicated fax. Anybody walking into this house would believe I use this room for work, despite the comforts and conveniences I have here.
Now. I have made my living as a writer -- and only a writer -- for more than 25 years. I have never been audited. *knocks wood* I know a LOT of other writers, and few of them have been audited. For those who have, the home office deduction was never an issue.
Because, after all -- where else would a self-employed writer write except in his or her home (assuming you don't keep a separate office elsewhere)?
Sure, you have to follow certain rules if you later sell your house. But in taking the home office deduction, you can also take a percentage of your HVAC costs, based on square footage. And a percentage of various taxes. Possibly a percentage of your mortgage. And so on. A good accountant can advise you; an accountant who understands how writers work and get paid is a huge bonus.
The home office thing aside, as a writer you can also deduct all books you buy -- not just research books; reading widely helps in your career because it's market awareness. You can deduct DVDs and satellite costs, both for research and, again, market awareness. You can deduct all magazines and newspapers. I keep a separate office phone line, so that's fully deductible.
Hell, the lamps in here, replacement lightbulbs, a percentage of my cleaning (as in Merry Maids) costs, even artwork -- all are legitimate expenses to be deducted or depreciated. The window treatments in here. The rugs.
Here's the thing. We don't deal in a cash business. (At least not if we're published rather than printed, and not responsible for hand-selling our own books.) Every dime we earn gets reported. So as long as you keep receipts, and good records, you're really not all that likely to be audited unless it's one of the random ones.
I don't happen to believe I should avoid legitimate deductions out of the fear that I may one day have to argue this or that deduction with an IRS agent. Even my previous accountant, a very, very conservative man, encouraged me to deduct everything I could argue as being necessary for the advancement of my career.
We have "companies" that don't, generally, have a high overhead. We keep our desks and chairs for decades, most of us, because they're broken-in and comfortable. We change our computers when necessary, and for most of us that means wearing out the old one. (I'm missing so many letters on the keys of this computer's keyboard that anyone who didn't touch-type would be lost trying to use it.)
Our deductions tend to be small in the scheme of things. Again, that's assuming a successful career as a writer; writers not showing a profit to the IRS are a different matter entirely.
Anyway, my view has always been that you keep all your receipts and deduct everything you can. Which I do.
I am not an accountant and I've never played one on TV. I'd advise anybody to have a good accountant and to listen to him/her (after educating him/her on the publishing business).
If writing is a part-time gig, and you do indeed have an office (and job) elsewhere, then anything you deduct at home is far more likely to raise a red flag.
As with most things, seek the advice of a professional.
And now, I'm going to wander away after giving my yearly A Home Office Deduction is Not a Guaranteed Audit speech.