Even if you have relatives sa Customs -- you will pay. Hindi ka nga lang kaliskisan big time.
Ok, if you are bringing in container vans -- per 20footer ang unit of computation for taxes -- x for 20 footer; 2x for a 40footer, etc simple math of corruption. Lol
May lower rate for bukasan. May higher rate for no bukasan (but puede ka pa rin ma double cross dito). You cannot deal with Customs directly, at the harbors. You must get a customs brokerage, its agent negotiates and pays for you.
You must stuff your container up to the point ma sukasuka na so that mabawi mo the undeclared fee you pay to the corrupt. (Bibigyan ka ng recibo naman -- for a portion of the total you fork over. Lol)
When we import dump trucks/heavy eqpmnt from Japan -- we fill up all free spaces with tires & tools. Pag nag bukasan - they negotiate with you only for the big items (the trucks/heavy eqpmnt.).
If you are gonna bring it with you through the airport -- do NOT use boxes. Ayos ka dyan. Use cheap huge duffle bags or suitcases. If you can get promo cheapo fares -- better you bring a maid or 2 to distribute your luggages -- yan, baka nakalusot ka pa, or -- hindi ka gitgitin masyado. Kahit na baggage allowance is 1 from your destination (ex. HK, within Asia) -- act casual, with your 2 suitcases.
If you have more than 2 full suitcases -- titignan ka na nila.
Best you bring only max 15pcs of any item para hindi ka maipit ek-ek "commercial qty". Do not bother with undervalued receipts -- hasa na sila, they will not honor your receipt -- magaling sila mag eyeball estimate, puede mo na sila isali sa Price Is Right game show.
Alam mo what boxes are not taxed sa airport?
Ang ilagay mo on the box in big letters the recognizable name of a person sa Malacanang or PNP/Airforce (not Army, not Navy, lol) or Senator/Congressman/Mayor of MManila. Kahit 1 train of boxes pa ipasok mo. BUT the customs aswang expect 1/2 (with ID of the Office )secu of the VIperson to be there with you at the Customs choke point (may access pass sila kaya naka pasok ) to fetch the boxes from you. Lol.
So, to answer your question: You will be taxed for sure. 98% sure -- for bringing in over 2 suitcases all by your one self.
If you are gonna import for resale - do it big: by the container para hindi ganon ka hirap to make profits. But of course, higher risk = bigger potential.
Good luck. Think it out well.