My CPA said the exact opposite, lol. My wife and I would be throwing away deduction money if we wrote of 70k outright (on top of our mortgage and other business deductions). 10k on the other hand easily helps lower our tax burden and extends through the next 5 years...
Futhermore, any smart financial planner would tell you to finance the whole thing because you can easily make more return on investment than the 1.5% auto rate I'm getting...
So the problem with this is that vehicles are not normal business expenditures. They are subject to depreciation which means how much and in how much time the tax break can be done. Whether you finance or not the same rules apply.
If you want to stretch the Section 179 rule and claim this is a "heavy non-SUV" despite it's <6ft bed then you can take the full deduction year 1 whether it's financed or not. If you don't stretch this rule then you're limited to $25k year 1 and then it would take many, many years to completely take the full depreciation on something $70k.
And more to the point only business use can be claimed. Any personal use prorates these limits.
Most CPA's are not good at their jobs. When my business got more complicated with s-corp elections and foreign entity statuses I realized this very quickly. You have to become your own expert. CPA's tend to know one thing well and then only have a passing familiarity with everything else (I guess kind of like a foot doctor or something). If any of you were planning on writing off your loan amount each year and/or the entire truck expense you're doing it wrong and that's all there is to say about it. Probably happens 90% of the time and only the people who get audited get burned.
I brought all this up because someone was bragging on the Internet and for that I cannot stand.