butions requires clear rules to determine the location of the user and meth-
ods for determining the tax base. Without any direct measure of user value,
DSTs tend to approximate the user contribution of a country based on sales
revenues. User based DSTs tend to include revenue thresholds to determine
in scope businesses. High thresholds may result in targeting a few interna-
tional rms and risk retaliation, while too low a threshold may deter entry
by smaller rms.
16
Moreover, since the tax is payable by the non-resident
MNE, the introduction of a DST comes with requirements for registration
and regular ling of returns and payment of tax due, which entails collec-
tion challenges.
e modied Indian Equalization Levy introduced in 2020 is the broadest
user-based DST adopted globally to date, but the incidence can be dicult
to assess. e Indian approach builds on the European model,
17
but expands
its scope to cover all (B2B and B2C) digital sales of its own goods, content
16
Potentially contributing to further market concentration in the tech sector.
17
In 2018 the EU Commission proposed a DST of 3percent on the gross revenue from activities relying on
user participation such as selling online advertising space and intermediary activities that allow users to interact
and sell goods and services.
Table 4. The Economic Impact of DSTs
Issues… ...and opportunities
Taxing rights and revenue
Introduction of (unliteral) DSTs risks international double taxation if not
creditable against corporate income tax payable in-home jurisdictions.
International tax rules aimed at profit are particularly hard to apply to
providers of automated digital services operating two-sided platforms
(Schindler and Schjelderup 2010). DSTs allow countries to capture
uncompensated value generated by a country’s citizens, and to share
in the rents from digitalized businesses, while taxation of profits
is difficult.
1
Efficiency and social welfare
When taxing some activities on a gross rather than a net basis distortion
may result. Taxation of loss makers risks disrupting innovative business
development/disincentivizing investment in these sectors. It is common
for developers of ADS to initially have and use aggressive pricing
strategies to gain market share/user participation.
In practice, production decisions of ADS service providers may not be
influenced at the margin; for profitable businesses taxing revenue is
not significantly different from profit-based taxation where the marginal
cost of providing additional services is minimal, as is arguably the case
for many ADS (Cui and Hashimzade 2019; Koethenbuerger 2020). In the
context of heavily concentrated market power, which is typical for two-
sided digital platforms, taxation may have positive welfare effects (Kind
and others 2008).
By targeting only some activities an inefficient wedge may be driven
between activities in and out of scope (Aslam and Shah 2020).
To the extent that the levy reduces any tax-induced comparative
advantage that foreign suppliers may enjoy over domestic suppliers,
equalizing the tax treatment could ease production inefficiencies.
If the burden of tax is passed onto customers, increases in the cost of
advertising opportunities on platforms may lead business to revert to
less efficient marketing strategies.
Incidence effects are complex in two-sided markets (IMF 2019). Firms
may aim to shift some burden to the untaxed side: a tax on advertising
creates an incentive to raise the price charged (or reduce the subsidy
provided) to users; the price of advertising services may even fall.
2
Cui
and Hashimzade (2019) show that when the marginal cost is non-zero,
the incidence of a tax on platform revenue will fall on both the platform
and the advertisers/producers, but the effect on consumers
is ambiguous.
1
As noted by Wei Cui (2021), concerns of potential double taxation of DSTs are also mitigated by the expectation of the economic incidence primarily
falling on consumers.
2
On tax incidence in two-sided markets, see also Bourreau and others (2018) and Kind and others (2008).
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