Trump has talked a lot about Mexico, imposing a border tax and getting them to pay for the wall. USD/MXN has reacted aggressively, and although it is off its highs in common with the general USD dip in recent weeks, USD/MXN is still 60% higher than it was 2 years ago. But it seems to me the market ha been overly focused on Mexico when it comes to Trump’s trade policies. While he has been very vocal on the possibility of a tariff on Mexican and/or Chinese goods, the actual plan for a border tax adjustment looks much more likely to be along the lines proposed by the House Republicans. This would be part of a general tax reform involving a cut in the corporate tax rate to 20% and a “border adjustment tax” of 20%. Such a tax would likely be charged on all imports (while all exports would be tax-deductible) regardless of where the imports come from. It seems unlikely the new system would be focused on Mexico or any other single country. As such, it seems the reaction seen in USD/MXN is excessive relative to the reaction seen in other currency pairs.
This sort of tax is normally associated with consumption tax based systems like VAT. In that case, a tax is added to imports to level the playing field with domestic goods on which VAT has been charged, while exporters get VAT refunded. Although the US system isn’t a consumption tax based system, the idea is to switch the US system to a territorial system in which companies are only taxed on revenues earned domestically rather than the current worldwide system in which US companies are taxed on all revenues. The argument is then that the system (a destination based cash flow tax or DBCFT) will then be broadly equivalent to a consumption based tax system. There are several technical arguments about deduction for wages and land which mean that this is probably not correct, and the tax my consequently be against WTO rules. This may be a problem for the system in the long run, but establishing whether it breaches WTO rules and generating a response will take some time, and the short to medium term impact of such a policy, if implemented, is likely to be significant.
If such a system is implemented, it will immediately increase import prices and reduce export prices. From a trade perspective, it would effectively be equivalent to a devaluation of the USD by 20%. The academic response from trade economists to such a policy is that the market reaction would be for the USD to appreciate by 20%, leaving everything real effectively unchanged. But in practice this won’t happen. The level of the USD doesn’t only affect trade, but also asset values and capital flows, and changes in such flows in response to moves in the USD are often larger and almost always faster than changes in trade flows. It is also the case that some of the reaction has already happened, notably in the MXN. Even so some currencies are still likely to be affected if such a plan is put into practice, as it may be in time for the 2018 tax year.
While some impact can be expected on many currencies, of the liquid currencies the CAD seems much the most vulnerable. 75% of Canada’s exports go to the US, making up 4% of its GDP, so such a big move in the terms of trade would have a huge impact. Unlike USD/MXN, the CAD doesn’t start from a position of being cheap. The consumption based PPP for USD/CAD is around 1.30. Other major currencies may also be hit, but they are all less exposed to trade with the US. Many also start from a cheaper level (notably the EUR) and are more capital market determined (the EUR and the JPY). From a risk perspective, if such policies are perceived as damaging to US growth, the CAD could also be expected to suffer from the impact on risk appetite and commodity prices. Add to this the fact that the CAD has strongly outperformed rate spreads this year (see chart), so will probably weaken anyway if the market takes a positive view of Trump/Congress tax and spending plans, and the potential upside for USD/CAD looks substantial.